ltc6360 Linear Technology Corporation, ltc6360 Datasheet

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ltc6360

Manufacturer Part Number
ltc6360
Description
Very Low Noise Single-ended Sar Adc Driver With True Zero Output
Manufacturer
Linear Technology Corporation
Datasheet

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FeaTures
applicaTions
Typical applicaTion
n
n
n
n
n
n
n
n
n
n
n
0V TO 4V
Output Swings to True Zero on Single Supply
2.3nV/√Hz Noise Density
Fast Settling Time: 150ns, 16-Bit, 4V Step
110dB SNR in 3MHz Bandwidth
Low Distortion, HD
for 4V
Low Offset Voltage: 250µV Max
Low Power Shutdown: 350µA Max
3mm × 3mm 8-Pin DFN and 8-lead MSOP Packages
16-Bit and 18-Bit SAR ADC Driver
High Speed Buffer Amplifiers
Low Noise Signal Processing
V
IN
+
P-P
Output at 40kHz
+IN
–IN
+
LTC6360
2
SHDN
OUT
10
5V
= –103dBc and HD
330pF
ADC Driver
CPI
V
CHARGE
PUMP
CC
0.1µF
CPO
R ADC
0.1µF
V
DD
GND
3
1µF
5V
= –109dBc
10µF
ADC
5V
Very Low Noise Single-Ended
6360 TA01a
DescripTion
The LTC
speed amplifier suitable for driving SAR ADCs. The
LTC6360 features a total output noise of 2.3nV/√Hz
combined with 150ns settling time to 16-bit levels (A
While powered from a single 5V supply, the amplifier out-
put can swing to 0V while maintaining high linearity. This
is made possible with the inclusion of a very low noise
on-chip charge pump that generates a negative voltage
to bias the output stage of the amplifier, increasing the
allowable negative voltage swing.
The LTC6360 is available in a compact 3mm × 3mm,
8-pin leadless DFN package and an 8-pin MSOP package
with exposed pad and operates over a –40°C to 125°C
temperature range.
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.
®
6360 is a very low noise, high precision, high
with True Zero Output
–100
–110
–120
–130
–140
–60
–70
–80
–90
0
f
V
IN
OUT
= 20kHz
Harmonic Distortion vs
= 0V TO V
1
Output Amplitude
SAR ADC Driver
P-P
HD2
V
2
OUT
HD3
(V
P-P
3
)
LTC6360
4
6360 TA01b
5
V
= 1).
1
6360f

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ltc6360 Summary of contents

Page 1

... The LTC6360 is available in a compact 3mm × 3mm, 8-pin leadless DFN package and an 8-pin MSOP package with exposed pad and operates over a –40°C to 125°C temperature range ...

Page 2

... LTC6360IDD#PBF LTC6360IDD#TRPBF LTC6360HDD#PBF LTC6360HDD#TRPBF LTC6360CMS8E#PBF LTC6360CMS8E#TRPBF LTC6360IMS8E#PBF LTC6360IMS8E#TRPBF LTC6360HMS8E#PBF LTC6360HMS8E#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: ...

Page 3

... No Load Sourcing 1mA No Load Sinking 1mA Sourcing, Output Shorted to GND, V – 200mV +IN –IN Sinking, Output Shorted – –200mV +IN –IN LTC6360 = 5V 2V 5V. See DD +IN SHDN MIN TYP MAX UNITS 30 250 µV 600 µ 250 µV 600 µ ...

Page 4

... LTC6360 elecTrical characTerisTics temperature range, otherwise specifications are at T Figure 1 for circuit configuration. SYMBOL PARAMETER V SHDN Pin Input Voltage, Logic Low L V SHDN Pin Input Voltage, Logic High H I SHDN Pin Current, Logic High SHDNH I SHDN Pin Current, Logic Low SHDNL ...

Page 5

... INPUT COMMON MODE VOLTAGE (V) 6360 G04 meet specified performance from –40°C to 125°C, but are not tested or QA sampled at these temperatures. The LTC6360I is guaranteed to meet specified performance from –40°C to 85°C. The LTC6360H is guaranteed to meet specified performance from –40°C to 125°C. ...

Page 6

... LTC6360 Typical perForMance characTerisTics see Figure 1 for circuit configuration. Input Bias Current vs Temperature –6 – –10 +IN –12 – –16 +IN –18 – –50 –25 75 100 TEMPERATURE (°C) 6360 G07 Total Supply Currents vs Supply Voltage 125° 25°C ...

Page 7

... IN –1 –2 500ns/DIV Frequency Response vs Temperature 4 0 –2 – 125°C – 25° –40°C A –8 0 100 FREQUENCY (MHz) LTC6360 T = 25° +IN Output Impedance vs Frequency 100 0.1 0.01 0.001 60 0.01 0 FREQUENCY (MHz) 6360 G17 ...

Page 8

... LTC6360 Typical perForMance characTerisTics see Figure 1 for circuit configuration. Small Signal Step Response 2.10 2.00 1.95 1.90 200ns/DIV 6360 G24 Slew Rate vs Temperature 160 FILT RISING C = 330pF FILT 120 FALLING 100 –50 – 100 TEMPERATURE (°C) 6360 G27 CPO Voltage vs CPO Load Current 1 ...

Page 9

... GND (Exposed Pad Pin 9): Ground Pin. Normally con- nected to ground. 1µF 0.1µ SHDN CPI GND V GND CC V SHDN CC CPI GND V CC OUT 2 R FILT 10 C FILT 330pF LTC6360 5 CPO V GND CHARGE PUMP GND GND 6360 BD 5V 0.1µF 10µF 6360f 9 ...

Page 10

... LTC6360 TesT circuiT 10 V SHDN 0.1µF + – – IN +IN SHDN CPI CPO LTC6360 + CHARGE PUMP – GND V V –IN OUT CC DD 6360 F01 R 0.1µF FILT 10 V OUT C FILT 330pF Figure 1. Test Circuit 1µ 10µF 6360f ...

Page 11

... The LTC6360 features a low noise amplifier that can support a signal-to-noise ratio of 110dB over a 3MHz noise bandwidth. Basic Connections Shown in Figure typical application for the LTC6360 as a unity gain driver. The amplifier’s two inputs (+IN and –IN) can accommodate a voltage range 4.25V on 4V ...

Page 12

... For instance, to set the – 1.5V, CC LTC6360 in a gain of +2, R set to 2k. If the total capacitance at –IN (LTC6360 plus PC board) were 2pF, a new pole would be formed in the loop response at 80MHz, which could lead to instability or ringing in the step response. A capacitor connected across the feedback resistor and having the same value as the total – ...

Page 13

... Compared to a two chip solution, the LTC6360 offers several advantages: a more compact layout with lower part count, lower output ripple, less EMI and lower power. ...

Page 14

... Output Compensation The LTC6360 is internally compensated to be gain of 5 stable. Lower gains require an external RC network at the output to provide compensation. The amplifier has been decompensated to provide the highest possible gain-bandwidth with a typical RC load of 10Ω in series with 330pF ...

Page 15

... DNI – Do Not Install Interfacing the LTC6360 to A/D Converters When driving an ADC, a single-pole RC filter between the output of the LTC6360 and the input of the ADC can (7) improve system performance. The sampling process of ADCs creates a charge transient at the ADC input LTC6360 > • ...

Page 16

... The SHDN pin is 5V TTL or 3.6V CMOS level compatible. CPO If the SHDN pin (Pin 7) is pulled low, below 0.8V, the LTC6360 will power down. If the pin is left open or pulled high, above 2.0V, the part will enter normal active opera- GND tion. The turn-on time between the shutdown and active states is typically 1μ ...

Page 17

... F G bypassing with a small capacitor across R Using a single pole passive RC filter network at the output of the LTC6360 reduces the output noise bandwidth and thereby increases the signal to noise ratio of the system. For example typical system with an output sig- nal output filter with R ...

Page 18

... V VCM JP1 E1 SHDN 1 E2 ENABLE 1µF DISABLE 0.1µF 3 R13* OPT R3 49.9 OPT +IN SHDN CPI 0805 LTC6360CMS8E –IN OUT OPT C8 R6 OPT OPT R5 C6 NPO R8** R10 OPT OPT 10 OPT 0805 0805 R9 0 C15** ...

Page 19

... Figure 11. DC1639A Demoboard Layout LTC6360 6360 F11 19 6360f ...

Page 20

... SAR ADC. For a clean interface, two condi- tions must be met: 1. The gain is selected so that full-scale signals at HV are translated at the output of the LTC6360 to the ap- propriate full-scale range for the ADC ...

Page 21

... The LTC2054 chopper stabilized op amp acts to servo the DC voltage at the JFET gate to 0V, which allows the output of the LTC6360 to swing to 0V when there is no photo diode current. Amplifier output noise density is dominated by the 130nV/√ ...

Page 22

... LTC6360 package DescripTion 3.5 ±0.05 1.65 ±0.05 2.10 ±0.05 (2 SIDES) 0.25 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 0.200 REF 22 DD Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698 Rev C) 0.70 ± ...

Page 23

... TYP 0.53 ± 0.152 1.10 (.021 ± .006) (.043) MAX SEATING PLANE 0.22 – 0.38 (.009 – .015) 0.65 TYP (.0256) BSC LTC6360 1.88 (.074) 0.29 REF 1.68 (.066) 0.05 REF DETAIL “B” CORNER TAIL IS PART OF THE LEADFRAME FEATURE. DETAIL “B” FOR REFERENCE ONLY NO MEASUREMENT PURPOSE 0.52 (.0205) REF 3.00 ± ...

Page 24

... Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 40fF (PARASITIC) 100 1µF 806 5V + LTC6360 NXP BF862 – 0.1µF CPO CPI 1µF 133 0.1µF 100k 10M GAIN = 1M 5V –3dB BW = 4MHz 10M OUTPUT NOISE = 710µV – ...

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