ltc1415csw-trpbf Linear Technology Corporation, ltc1415csw-trpbf Datasheet

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ltc1415csw-trpbf

Manufacturer Part Number
ltc1415csw-trpbf
Description
12-bit, 1.25msps, 55mw Sampling A/d Converter
Manufacturer
Linear Technology Corporation
Datasheet
FEATURE
A
TYPICAL
, LTC and LT are registered trademarks of Linear Technology Corporation.
PPLICATI
High Speed Data Acquisition
Imaging Systems
Digital Signal Processing
Multiplexed Data Acquisition Systems
Telecommunications
1.25Msps Sample Rate
Single 5V Supply
Power Dissipation: 55mW
Nap and Sleep Power Shutdown Modes
72dB S/(N + D) and 80dB THD at 100kHz
External or Internal Reference Operation
True Differential Inputs Reject Common Mode Noise
Input Range: 4.096V (1mV/LSB)
28-Pin SSOP and SO Packages
0.35LSB INL and 0.25LSB DNL
10 F
ANALOG INPUT
PARALLEL
(0V TO 4.096V)
DIFFERENTIAL
V
REF
12-BIT
BUS
1.25MHz, 12-Bit Sampling A/D Converter
OUTPUT
2.50V
A
S
O
PPLICATI
10
11
12
13
14
1
2
3
4
5
6
7
8
9
U
+A
–A
V
REFCOMP
AGND
D11(MSB)
D10
D9
D8
D7
D6
D5
D4
DGND
REF
IN
IN
S
LTC1415
NAP/SLP
CONVST
SHDN
OGND
BUSY
DV
OV
AV
O
RD
DD
DD
DD
CS
D0
D1
D2
D3
U
28
27
26
25
24
23
22
21
20
19
18
17
16
15
LINES
P CONTROL
OUTPUT LOGIC
SUPPLY 3V OR 5V
1415 TA01
5V
10 F
D
The LTC
A/D converter that draws only 55mW from a single 5V
supply. This easy-to-use device includes a high dynamic
range sample-and-hold, precision reference and a trimmed
internal clock. Two power shutdown modes provide flex-
ibility for low power systems.
The LTC1415’s full-scale input range is 4.096V. Low
linearity errors 0.35LSB INL, 0.25LSB DNL make it
ideal for imaging systems. Outstanding AC performance
includes 72dB S/(N + D) and 80dB THD with an input
frequency of 100kHz.
The unique differential input sample-and-hold can acquire
single-ended or differential input signals up to its 18MHz
bandwidth. The 60dB common mode rejection allows
users to eliminate ground loops and common mode noise
by measuring signals differentially from the source.
The ADC has a P compatible, 12-bit parallel output port.
There is no pipeline delay in the conversion results. A
separate convert start input and data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors. A
separate output logic supply pin allows direct connection
to 3V components.
ESCRIPTIO
Sampling A/D Converter
12-Bit, 1.25Msps, 55mW
Effective Bits and Signal-to-(Noise + Distortion)
®
1415 is a 700ns, 1.25Msps, 12-bit sampling
12
11
10
9
8
7
6
5
4
3
2
1
0
1k
f
SAMPLE
U
vs Input Frequency
= 1.25Msps
INPUT FREQUENCY (Hz)
10k
FREQUENCY
NYQUIST
100k
LTC1415 • TA02
1M 2M
LTC1415
74
68
62
56
1

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ltc1415csw-trpbf Summary of contents

Page 1

... Input Range: 4.096V (1mV/LSB) 28-Pin SSOP and SO Packages O U PPLICATI S A High Speed Data Acquisition Imaging Systems Digital Signal Processing Multiplexed Data Acquisition Systems Telecommunications , LTC and LT are registered trademarks of Linear Technology Corporation TYPICAL A PPLICATI 1.25MHz, 12-Bit Sampling A/D Converter LTC1415 DIFFERENTIAL 1 ANALOG INPUT +A ...

Page 2

... V 5.25V High Between Conversions During Conversions 0V < V < MHz TOP VIEW ORDER PART NUMBER LTC1415CG LTC1415CSW 25 BUSY LTC1415IG LTC1415ISW CONVST SHDN 20 NAP/SLP 19 OGND PACKAGE 28-LEAD PLASTIC SO WIDE ...

Page 3

ACCURACY SYMBOL PARAMETER S/( Signal-to-(Noise + Distortion) Ratio THD Total Harmonic Distortion SFDR Spurious Free Dynamic Range IMD Intermodulation Distortion Full-Power Bandwidth Full-Linear Bandwidth TER AL REFERE CE CHARACTERISTICS ...

Page 4

LTC1415 CHARACTERISTICS SYMBOL PARAMETER f Maximum Sampling Frequency SAMPLE(MAX) Conversion and Acquisition Time t Conversion Time CONV t Acquisition Time ACQ Setup Time CONVST Setup Time 2 ...

Page 5

W U TYPICAL PERFORMANCE CHARACTERISTICS S/( Input Frequency and Amplitude 0dB –20dB –60dB 10k 100k 1M 2M INPUT ...

Page 6

LTC1415 W U TYPICAL PERFORMANCE CHARACTERISTICS Power Supply Feedthrough vs Ripple Frequency 0 –10 –20 –30 –40 –50 –60 – –80 DGND –90 OV –100 1k 10k 100k RIPPLE FREQUENCY (Hz CTIO S ...

Page 7

CTIO AL BLOCK DIAGRA +A IN – 2.5V REF REF REF AMP REFCOMP (4.096V) AGND DGND TEST CIRCUITS Load Circuits for Access Timing DBN DBN (A) Hi AND ...

Page 8

LTC1415 U U APPLICATIONS INFORMATION CONVERSION DETAILS The LTC1415 uses a successive approximation algorithm and an internal sample-and-hold circuit to convert an analog signal to a 12-bit parallel output. The ADC is complete with a precision reference and an internal ...

Page 9

U U APPLICATIONS INFORMATION Effective Number of Bits The effective number of bits (ENOBs measurement of the resolution of an ADC and is directly related to the S/( the equation [S/( ...

Page 10

LTC1415 U U APPLICATIONS INFORMATION the presence of another sinusoidal input at a different frequency. If two pure sine waves of frequencies fa and fb are applied to the ADC input, nonlinearities in the ADC transfer func- tion can create ...

Page 11

... For example Figure 7 shows a 1000pF capacitor from +A to ground and a 100 source resistor IN to limit the input bandwidth to 1.6MHz. The 1000pF LinearView is a trademark of Linear Technology Corporation capacitor also acts as a charge reservoir for the input sample-and-hold and isolates the ADC input from sam- pling glitch sensitive circuitry ...

Page 12

LTC1415 U U APPLICATIONS INFORMATION circuitry. The reference amplifier gains the voltage at the V pin by 1.638 to create the required internal reference REF voltage of 4.096V. This provides buffering between the V pin and the high speed capacitive ...

Page 13

U U APPLICATIONS INFORMATION 4.096V to 2.048V and shifts the common mode voltage from half of full scale to 2.274V. AC Coupled Inputs The analog inputs can be AC coupled for applications where the input has no DC information. The ...

Page 14

LTC1415 U U APPLICATIONS INFORMATION limitations at high input frequencies (THD = 75dB at 600kHz). The ADC in Figure 10e has a full scale of 2.048V and a common mode of 2.27V. The reduced signal swing of this circuit results ...

Page 15

U U APPLICATIONS INFORMATION width for these tracks should be as wide as possible. In applications where the ADC data outputs and control signals are connected to a continuously active micropro- cessor bus possible to get errors in ...

Page 16

LTC1415 U U APPLICATIONS INFORMATION ...

Page 17

U U APPLICATIONS INFORMATION Figure 13b. Suggested Evaluation Circuit Board Component Side Silkscreen Figure 13c. Suggested Evaluation Circuit Board Component Side Layout W U LTC1415 17 ...

Page 18

LTC1415 U U APPLICATIONS INFORMATION Figure 13d. Suggested Evaluation Circuit Board Solder Side Layout DIGITAL INTERFACE The A/D converter is designed to interface with micropro- cessors as a memory mapped device. The CS and RD control inputs are common to ...

Page 19

PPLICATI S I FOR ATIO SHDN t 4 CONVST Figure 14b. SHDN to CONVST Wake-Up Timing Timing and Control Conversion start and data read operations are controlled by three digital inputs: CONVST, CS and RD. A ...

Page 20

LTC1415 PPLICATI S I FOR ATIO CONVST BUSY DATA Figure 17. Mode 1b CONVST Starts a Conversion. Data is Read by RD CONVST t 6 BUSY RD DATA Figure 18. Mode 2 CONVST Starts ...

Page 21

PPLICATI S I FOR ATIO RD = CONVST t 6 BUSY t 10 DATA (N – 1) DATA DB11 TO DB0 CONVST t 6 BUSY t 10 DATA ...

Page 22

LTC1415 PACKAGE DESCRIPTIO 0.205 – 0.212** (5.20 – 5.38) 0.005 – 0.009 0.022 – 0.037 (0.13 – 0.22) (0.55 – 0.95) * DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSIONS DO ...

Page 23

... DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... Fully Specified for 3V-Powered Applications, f SAMPLE Best Dynamic Performance, f 800ksps, 80mW Dissipation SAMPLE Best Dynamic Performance, THD = 84 and SINAD = 71 at Nyquist 81.5dB SINAD, 150mW from 5V Supplies Single Supply, 10V Input Range, Low Power sn1415 1415fs LT/TP 0497 7K • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996 300ksps 140ksps ...

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