IC AMP/DVR I/O GAIN OF 2 8MSOP

LTC1992-2CMS8

Manufacturer Part NumberLTC1992-2CMS8
DescriptionIC AMP/DVR I/O GAIN OF 2 8MSOP
ManufacturerLinear Technology
LTC1992-2CMS8 datasheet
 


Specifications of LTC1992-2CMS8

Amplifier TypeDifferentialNumber Of Circuits1
Output TypeDifferential, Rail-to-RailSlew Rate1.5 V/µs
Gain Bandwidth Product3.2MHzCurrent - Input Bias2pA
Voltage - Input Offset250µVCurrent - Supply700µA
Current - Output / Channel30mAVoltage - Supply, Single/dual (±)2.7 V ~ 11 V, ±1.35 V ~ 5.5 V
Operating Temperature0°C ~ 70°CMounting TypeSurface Mount
Package / Case8-MSOP, Micro8™, 8-uMAX, 8-uSOP,Lead Free Status / RoHS StatusContains lead / RoHS non-compliant
-3db Bandwidth-  
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FeaTures
Adjustable Gain and Fixed Gain Blocks of 1, 2, 5
n
and 10
±0.3% (Max) Gain Error from –40°C to 85°C
n
3.5ppm/°C Gain Temperature Coefficient
n
5ppm Gain Long Term Stability
n
Fully Differential Input and Output
n
C
Stable up to 10,000pF
n
LOAD
Adjustable Output Common Mode Voltage
n
Rail-to-Rail Output Swing
n
Low Supply Current: 1mA (Max)
n
High Output Current: 10mA (Min)
n
Specified on a Single 2.7V to ±5V Supply
n
DC Offset Voltage <2.5mV (Max)
n
Available in 8-Lead MSOP Package
n
applicaTions
Differential Driver/Receiver
n
Differential Amplification
n
Single-Ended to Differential Conversion
n
Level Shifting
n
Trimmed Phase Response for Multichannel Systems
n
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion
Single-Supply, Single-Ended to Differential Conversion
5V
10k
1
0V
V
IN
7
–5V
2
10k
8
0.01µF
INPUT SIGNAL
FROM A
±5V SYSTEM
Low Power, Fully Differential
Amplifier/Driver Family
DescripTion
The LTC
1992 product family consists of five fully differen-
®
tial, low power amplifiers. The LTC1992 is an unconstrained
fully differential amplifier. The LTC1992-1, LTC1992-2,
LTC1992-5 and LTC1992-10 are fixed gain blocks (with
gains of 1, 2, 5 and 10 respectively) featuring precision
on-chip resistors for accurate and ultrastable gain. All of
the LTC1992 parts have a separate internal common mode
feedback path for outstanding output phase balancing
and reduced second order harmonics. The V
the output common mode level independent of the input
common mode level. This feature makes level shifting of
signals easy.
The amplifiers’ differential inputs operate with signals
ranging from rail-to-rail with a common mode level from
the negative supply up to 1.3V from the positive supply.
The differential input DC offset is typically 250µV. The
rail-to-rail outputs sink and source 10mA. The LTC1992
is stable for all capacitive loads up to 10,000pF .
The LTC1992 can be used in single supply applications
with supply voltages as low as 2.7V. It can also be used
with dual supplies up to ±5V. The LTC1992 is available in
an 8-pin MSOP package.
10k
5V
3
5V
4
+
2.5V
(5V/DIV)
0V
V
MID
LTC1992
V
OCM
5V
+
2.5V
5
(2V/DIV)
0V
6
OUTPUT SIGNAL
FROM A
10k
SINGLE-SUPPLY SYSTEM
1992 TA01a
LTC1992 Family
Input/Output
V
IN
+OUT
–OUT
pin sets
OCM
5V
0V
–5V
5V
0V
1992 TA01b
1992fa


LTC1992-2CMS8 Summary of contents

  • Page 1

    ... The LTC1992 is stable for all capacitive loads up to 10,000pF . The LTC1992 can be used in single supply applications with supply voltages as low as 2.7V. It can also be used with dual supplies up to ±5V. The LTC1992 is available in an 8-pin MSOP package. 10k 5V ...

  • Page 2

    ... JA orDer inForMaTion LEAD FREE FINISH TAPE AND REEL LTC1992CMS8#PBF LTC1992CMS8#TRPBF LTC1992IMS8#PBF LTC1992IMS8#TRPBF LTC1992HMS8#PBF LTC1992HMS8#TRPBF LTC1992-1CMS8#PBF LTC1992-1CMS8#TRPBF LTC1992-1IMS8#PBF LTC1992-1IMS8#TRPBF LTC1992-1HMS8#PBF LTC1992-1HMS8#TRPBF LTC1992-2CMS8#PBF LTC1992-2CMS8#TRPBF LTC1992-2IMS8#PBF LTC1992-2IMS8#TRPBF LTC1992-2HMS8#PBF LTC1992-2HMS8#TRPBF LTC1992-5CMS8#PBF LTC1992-5CMS8#TRPBF LTC1992-5IMS8#PBF LTC1992-5IMS8#TRPBF LTC1992-5HMS8#PBF LTC1992-5HMS8#TRPBF LTC1992-10CMS8#PBF LTC1992-10CMS8#TRPBF LTC1992-10IMS8#PBF LTC1992-10IMS8#TRPBF LTC1992-10HMS8#PBF LTC1992-10HMS8#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. ...

  • Page 3

    ... Output Voltage, Low (Note 2) The denotes the specifications which apply over the full operating l = 25° 5V, – defined as (+V + –V )/2. V OUTCM OUT OUT – –V ). Specifications applicable to all parts in the LTC1992 family. OUT OUT ALL C AND I GRADE CONDITIONS MIN 2 2. ± 2.7V ...

  • Page 4

    ... The denotes the specifications which apply over the full operating l = 25° 5V, – defined as (+V + –V )/2. V OUTCM OUT OUT – –V ). Specifications applicable to all parts in the LTC1992 family. OUT OUT ALL C AND I GRADE CONDITIONS MIN V = 2.7V, V =1.35V OUT 2.5V ...

  • Page 5

    ... MIN –0. –0. INCM 0 180kHz TEST = 2.5V, unless otherwise noted the voltage on the V OCM + –V )/ defined as (+ INDIFF IN LTC1992-2CMS8 LTC1992-2ISM8 CONDITIONS MIN –0. –0. INCM 0 180kHz TEST LTC1992 Family = 2.5V, unless otherwise INCM OUTCM OCM is defined as (+V + – ...

  • Page 6

    ... TEST LTC1992H/LTC1992-XH are guaranteed functional over the extended operating temperature of –40°C to 125°C. Note 6: The LTC1992C/LTC1992-XC are guaranteed to meet the specified performance limits over the 0°C to 70°C temperature range and are and –V designed, characterized and expected to meet the specified performance ...

  • Page 7

    ... G07 LTC1992 Family Applicable to all parts in the LTC1992 family. Common Mode Offset Voltage vs Temperature INCM = OCM V = ± ±1.35V S –1 –2 –3 – ...

  • Page 8

    ... TIED TOGETHER) OUTPUTS +V = 2.5V S –V = –2. OCM LTC1992-10 SHOWN FOR REFERENCE 2000 50µs/DIV = 0V OCM OUTPUTS 1992 G15 Applicable to all parts in the LTC1992 family. Differential Input Offset Voltage vs Time (Normalized 100 TEMP = 35° –20 –40 25°C –60 –80 –100 0 400 800 1200 ...

  • Page 9

    ... COMMON MODE VOLTAGE (V) Power Supply Rejection Ratio vs Frequency (Note 7) 100 90 ∆V 80 – 100 1k 10k 100k FREQUENCY (Hz) LTC1992 Family Applicable to the LTC1992 only. Differential Phase Response vs Frequency 0 = 10k FB – 10k IN FB –40 –60 – LOAD –100 10pF 50pF –120 100pF 500pF –140 1000pF –160 ...

  • Page 10

    ... LTC1992 Family Typical perForMance characTerisTics Differential Input Large-Signal Step Response 0V 2µs/DIV Single-Ended Input Large-Signal Step Response 2.5V 2µs/DIV Differential Input Small-Signal Step Response 0V 1µs/DIV 0 Applicable to the LTC1992 only. Differential Input Large-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±1.5V IN –V = 1.5V ± ...

  • Page 11

    ... P-PDIFF = 5V OUT P-PDIFF –70 –80 –90 –100 10k 50k 1992 G34 –10 –15 –20 –25 –30 –35 1000 10000 1922 G36 LTC1992 Family Applicable to the LTC1992 only. Single-Ended Input Small-Signal Step Response C = 10000pF LOAD C = 1000pF LOAD + – 2.5V OCM + 200mV IN –V ...

  • Page 12

    ... COMMON MODE VOLTAGE (V) Applicable to the LTC1992-1 only. Differential Phase Response vs Frequency 0 –20 –40 –60 – LOAD –100 10pF 50pF –120 ...

  • Page 13

    ... G49 Differential Input Small-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±50mV IN –V = 50mV ± 0pF LOAD 0V 1µs/DIV 1992 G52 Applicable to the LTC1992-1 only. Differential Input Large-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±1.5V IN –V = 1.5V ± 10000pF LOAD C = 1000pF LOAD 20µ ...

  • Page 14

    ... V = 10V OUT P-PDIFF = 5V OUT P-PDIFF –70 –80 –90 –100 10k 50k 1992 G58 Applicable to the LTC1992-1 only. Differential Noise Voltage Density vs Frequency 1000 100 10 10 100 1000 1992 G56 FREQUENCY (Hz) THD + Noise vs Amplitude 500kHz MEASUREMENT BANDWIDTH + –V = –5V ...

  • Page 15

    ... COMMON MODE VOLTAGE (V) LTC1992 Family Applicable to the LTC1992-2 only. Differential Phase Response vs Frequency 0 –20 –40 –60 – LOAD –100 10pF 50pF –120 100pF 500pF –140 1000pF – ...

  • Page 16

    ... G71 Differential Input Small-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±25mV IN –V = 25mV ± 0pF LOAD 0V 2µs/DIV 1992 G74  Applicable to the LTC1992-2 only. Differential Input Large-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±750mV IN –V = 750mV ± 10000pF LOAD C = 1000pF LOAD 20µ ...

  • Page 17

    ... –70 OUT P-PDIFF OUT P-PDIFF – OUT P-PDIFF – 10V OUT P-PDIFF –100 100 1k FREQUENCY (Hz) Applicable to the LTC1992-2 only. Single-Ended Input Small-Signal Step Response C = 10000pF LOAD C = 1000pF LOAD 2. – 2.5V OCM + 100mV IN –V = 50mV IN 20µs/DIV 1992 G78 THD + Noise vs Amplitude – ...

  • Page 18

    ... COMMON MODE VOLTAGE (V) Applicable to the LTC1992-5 only. Differential Phase Response vs Frequency 0 –20 –40 –60 – LOAD –100 10pF 50pF – ...

  • Page 19

    ... G93 Differential Input Small-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±10mV IN –V = 10mV ± 0pF LOAD 0V 5µs/DIV 1992 G96 Applicable to the LTC1992-5 only. Differential Input Large-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ± 300mV IN –V = 300mV ± 10000pF LOAD C = 1000pF LOAD 20µ ...

  • Page 20

    ... OCM – OUT P-PDIFF OUT P-PDIFF – OUT P-PDIFF – 10V OUT P-PDIFF –90 –100 100 1k FREQUENCY (Hz) 0 Applicable to the LTC1992-5 only. Single-Ended Input Small-Signal Step Response C = 10000pF LOAD C = 1000pF LOAD 2. – 2.5V OCM + 40mV IN –V = 20mV IN 50µs/DIV 1992 G100 THD + Noise vs Amplitude – ...

  • Page 21

    ... COMMON MODE VOLTAGE (V) LTC1992 Family Applicable to the LTC1992-10 only. Differential Phase Response vs Frequency 0 –20 –40 –60 – LOAD –100 10pF 50pF – ...

  • Page 22

    ... G115 Differential Input Small-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±5mV IN –V = 5mV ± 0pF LOAD 0V 10µs/DIV 1992 G118  Applicable to the LTC1992-10 only. Differential Input Large-Signal Step Response +V = 2.5V S –V = –2. OCM +V = ±150mV IN –V = 150mV ± 10000pF LOAD C = 1000pF LOAD 20µ ...

  • Page 23

    ... OCM – OUT P-PDIFF OUT P-PDIFF – OUT P-PDIFF –80 –90 –100 100 1k FREQUENCY (Hz) Applicable to the LTC1992-10 only. Single-Ended Input Small-Signal Step Response C = 10000pF LOAD C = 1000pF LOAD 2. – 2.5V OCM + 20mV IN –V = 10mV IN 100µs/DIV 1992 G122 THD + Noise vs Amplitude – ...

  • Page 24

    ... LTC1992 Family pin FuncTions –IN, +IN (Pins 1, 8): Inverting and Noninverting Inputs of the Amplifier. For the LTC1992 part, these pins are connected directly to the amplifier’s P-channel MOSFET input devices. The fixed gain LTC1992-X parts have preci- sion, on-chip gain setting resistors. The input resistors are nominally 30k for the LTC1992-1, LTC1992-2 and LTC1992-5 parts ...

  • Page 25

    ... The LTC1992 family consists of five fully differential, low power amplifiers. The LTC1992 is an unconstrained fully differential amplifier. The LTC1992-1, LTC1992-2, LTC1992- 5 and LTC1992-10 are fixed gain blocks (with gains and 10 respectively) featuring precision on-chip resistors for accurate and ultra stable gain. ...

  • Page 26

    ... V IN LTC1992 + GAIN = – Figure 1. Comparison Amp and a Fully Differential Amplifier R IN – MID V 2 OCM R IN +IN – Figure 2. LTC1992 Functional Block Diagram with External Gain Setting Resistors  OUT Fully Differential Amplifier with Negative Feedback R IN – OUT LTC1992 INM ...

  • Page 27

    ... LTC1992 Family voltage. If either of these servos is taken out of /+V network is a mirror image duplicate of ...

  • Page 28

    ... Fortunately, all of basic applications circuits shown in Figure 4, as well as all of the fixed gain LTC1992-X parts, are equally suitable for both differential and single-ended input signals. For single-ended input signals, connect one of the inputs to a reference voltage (e.g., ground or mid-supply) and connect the other to the signal path. There are no tradeoffs here as the part’ ...

  • Page 29

    ... H • ( WHERE • 3-Pole Lowpass Filter – OUT ( WHERE R4C3 R2R3C1C2 R1 R1 • √R2R3 • – LTC1992 Family – +V OUT V LTC1992 OCM – –V OUT – +V OUT LTC1992 V OCM – –V OUT – +V OUT LTC1992 V OCM – –V OUT – ...

  • Page 30

    ... This small amount of positive feedback in- creases the input impedance. Driving Capacitive Loads The LTC1992 family of parts is stable for all capacitive loads least 10,000pF . While stability is guaranteed, the part’s performance is not unaffected by capacitive load- ing. Large capacitive loads increase output step response ringing and settling time, decrease the bandwidth and increase the frequency response peaking ...

  • Page 31

    ... INP and INM nodes of Figure 2. The specifications for the fixed gain LTC1992-X parts reflect a higher maximum limit as this specification is for the entire gain block and references the signal at the input resistors. Differential input signals and single-ended signals require a slightly different set of formulae ...

  • Page 32

    ... VOLTAGE AT INP AND INM NODES (V WITHIN THE SPECIFIED LIMITS. V INP V = INCM(AMP) OUTPUT SIGNAL CLIPPING LIMIT V (V INDIFF(MAX) P-PDIFF A 2AV V P-P REF –A INPUT COMMON MODE LIMITS (NOTE: FOR THE FIXED GAIN LTC1992-X PARTS INSIG(MAX INSIG(MIN (+V INSIGP-P OUTPUT SIGNAL CLIPPING LIMIT V = THE LESSER VALUE OF V ...

  • Page 33

    ... LTC1992 Family V OUTDIFF(MAX P-PDIFF 5.40 5.40 5.40 5.40 10.00 10.00 10.00 10.00 20.00 20.00 20.00 20.00 V OUTDIFF(MAX P-PDIFF 4 ...

  • Page 34

    ... LTC1992 Family applicaTions inForMaTion Table 1. Input Signal Limitations for Some Common Applications Mid-Supply Referenced Single-Ended Input Signal, V common mode limits and the output clipping) +V –V GAIN OCM (V) (V) (V/V) (V) 2 1.35 2 1.35 2 1. 2.5 5 – – – – Mid-Supply Referenced Single-Ended Input Signal, V ...

  • Page 35

    ... OSDIFF term equates to the formula in Figure 3 when β1 equals resistors in the β2. The amount of signal level shifting and the feedback CMM factor mismatch determines the second term. This term LTC1992 Family Min and Max values listed account for INSIG V V INSIGP-P(MAX) ...

  • Page 36

    ... LTC1992 Family applicaTions inForMaTion V INDIFF +V – – OUTDIFF WHERE • FOR GROUND REFERENCED, SINGLE-ENDED INPUT SIGNAL, LET +V V OUTDIFF • COMMON MODE REJECTION: SET +V CMRR = • OUTPUT DC OFFSET VOLTAGE: SET +V V OSDIFFOUT Figure 6. Basic Equations for Mismatched or Asymmetrical Feedback Applications Circuits quantifies the undesired effect of signal level shifting discussed earlier in the Signal Level Shifting section ...

  • Page 37

    ... This circuit does not have any common mode level constraints as the inverting input voltage sets the input common mode level. This circuit also delivers rail-to-rail output voltage swing without any concerns. OCM LTC1992 Family – OCM ) 1 ...

  • Page 38

    ... LTC1992 Family Typical applicaTions Interfacing a Bipolar, Ground Referenced, Single-Ended Signal to a Unipolar Single Supply, Differential Input ADC ( –2. Gives a Digital Mid-Scale Code) IN 0.1µF 40k 10k 13.3k 3 100 10k – MID 100pF LTC1992 2 V OCM 100 10k 8 + – 13.3k 10k 0.1µ ...

  • Page 39

    ... SNR =85.3dB – 333kHz THD = –72.1dB SAMPLE –20 SINAD = –72dB –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 –140 FREQUENCY (kHz) 1992 TA06b LTC1992 Family 5V 10µ DGND DD SHDN CONTROL µP CONVST 31 LOGIC CONTROL AND RD 30 LINES TIMING BUSY 10µ ...

  • Page 40

    ... LTC1992 Family package DescripTion 0.889 0.127 (.035 .005) 5.23 3.20 – 3.45 (.206) (.126 – .136) MIN 0.42 0.038 0.65 (.0165 .0015) (.0256) TYP BSC RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. ...

  • Page 41

    ... Updated Part Markings Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC1992 Family PAGE NUMBER 2 1992fa ...

  • Page 42

    ... LTC1992 Family Typical applicaTion Balanced Frequency Converter (Suitable for Frequencies up to 50kHz) 60kHz LOW PASS FILTER 120pF 9.53k 8.87k 1 7 330pF 2 BNC BNC 9.53k 8.87k INP INP 120pF V OCM relaTeD parTs PART NUMBER DESCRIPTION LT1167 Precision Instrumentation Amplifier LT1990 High Voltage, Gain Selectable Difference Amplifier ...