LTC1606 Linear Technology, LTC1606 Datasheet

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LTC1606

Manufacturer Part Number
LTC1606
Description
16-Bit/ 250ksps/ Single Supply ADC
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIONS
Sample Rate: 250ksps
Single 5V Supply
Bipolar Input Range: 10V
Signal-to-Noise Ratio: 90dB Typ
Power Dissipation: 75mW Typ
Integral Nonlinearity: 2.0LSB Max
Guaranteed No Missing Codes
Operates with Internal or External Reference
Internal Synchronized Clock
28-Pin SSOP Package
Improved 2nd Source to AD976A and ADS7805
Industrial Process Control
Multiplexed Data Acquisition Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
U
INPUT
10V
2.2 F
4.096V
10 F
200
33.2k
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.
2.5V
Low Power, 250kHz, 16-Bit Sampling ADC on 5V Supply
1
4
3
V
CAP
REF
IN
5V
1.64x
BUFFER
7.35k
4k
2.5k
AGND1
V
2
DIG
28
REFERENCE
V
AGND2
ANA
27
9k
5
DGND
SAMPLING ADC
The LTC
verter that draws only 75mW (typical) from a single 5V
supply. This easy-to-use device includes sample-and-
hold, precision reference, switched capacitor successive
approximation A/D and trimmed internal clock.
The LTC1606’s input range is an industry standard 10V.
Maximum DC specs include 2.0LSB INL and 16 bits no
missing codes over temperature. An external reference
can be used if greater accuracy over temperature is
needed.
The 90dB signal-to-noise ratio offers an improvement of
3dB over competing devices, and the RMS transition noise
is reduced (0.65LSB vs 1LSB) relative to competitive
parts.
The ADC has a microprocessor compatible, 16-bit or two
byte parallel output port. A convert start input and a data
ready signal (BUSY) ease connections to FIFOs, DSPs and
microprocessors.
DESCRIPTION
14
16-BIT
, LTC and LT are registered trademarks of Linear Technology Corporation.
LOGIC AND
CONTROL
TIMING
®
1606 is a 250ksps, sampling 16-bit A/D con-
D15 TO D0
BUSY
BYTE
1606 TA01
R/C
CS
15 TO 22
26
25
24
23
6 TO 13
U
Single Supply ADC
10 F
Final Electrical Specifications
DIGITAL
CONTROL
SIGNALS
16-Bit, 250ksps,
16-BIT
OR 2 BYTE
PARALLEL
BUS
0.1 F
LTC1606
March 2000
1

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LTC1606 Summary of contents

Page 1

... This easy-to-use device includes sample-and- hold, precision reference, switched capacitor successive approximation A/D and trimmed internal clock. The LTC1606’s input range is an industry standard 10V. Maximum DC specs include 2.0LSB INL and 16 bits no missing codes over temperature. An external reference can be used if greater accuracy over temperature is needed ...

Page 2

... Digital Input Voltage (Note 4) ........ V Digital Output Voltage ........ V DGND Power Dissipation .............................................. 500mW Operating Ambient Temperature Range LTC1606AC/LTC1606C ............................ LTC1606AI/LTC1606I ......................... – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 C U CONVERTER CHARACTERISTICS temperature range, otherwise specifications are at T ...

Page 3

... LTC1606/LTC1606A MIN TYP MAX 2.470 2.500 2.520 5 1 2.30 2.50 2.70 100 4.096 UNITS UNITS ...

Page 4

... C = 30pF L (Notes 9, 10 30pF, (Notes 10 30pF, (Notes 9, 10) L indicates specifications which apply over the full LTC1606/LTC1606A MIN TYP MAX 2.4 0 –10 A 4.5 = – 200 A 4.0 = 160 A 0.05 = 1.6mA 0.10 0.4 –10 10 LTC1606/LTC1606A MIN TYP MAX 250 2.5 1.5 40 2.5 2.5 100 UNITS ...

Page 5

... Pin 15 and bit 8 is output on Pin 22. Bit 7 is output on Pin 6 and the LSB is output on Pin 13. R/C (Pin 24): Read/Convert Input. With CS low, a falling edge on R/C puts the internal sample-and-hold into the hold state and starts a conversion. With CS low, a rising edge on R/C enables the output data bits. LTC1606 LTC1606/LTC1606A MIN TYP MAX UNITS 4.75 5.25 ...

Page 6

... LTC1606 PIN FUNCTIONS CS (Pin 25): Chip Select. Internally OR’d with R/C. With R/C low, a falling edge on CS will initiate a conversion. With R/C high, a falling edge on CS will enable the output data. BUSY (Pin 26): Output Shows Converter Status low when a conversion is in progress. Data valid on the rising edge of BUSY ...

Page 7

... DAC Figure 1. LTC1606 Simplified Equivalent Circuit W U Driving the Analog Inputs The nominal input range for the LTC1606 is 10V • V REF The input impedance is typically 10k , therefore, it should be driven with a low impedance source. Wideband noise coupling into the input can be minimized by placing a 1000pF capacitor at the input as shown in Figure 2 ...

Page 8

... F tantalum for the REF pin and 10 F tantalum for the CAP pin). Offset and Gain Adjustments The LTC1606 offset and full-scale errors have been trimmed at the factory with the external resistors shown in Figure 4. This allows for external adjustment of offset and full scale in applications where absolute accuracy is impor- tant ...

Page 9

... CS is brought back low again to initiate a read. Again recommended that both R/C and CS return high within 1 s after the start of the conversion CONVERT t CONV t 9 PREVIOUS Hi-Z NOT VALID DATA VALID LTC1606 t 5 ACQUIRE CONVERT t ACQ DATA Hi-Z VALID t 8 DATA VALID 1606 • F08 9 ...

Page 10

... LTC1606 U U APPLICATIONS INFORMATION t 10 R/C CS BUSY MODE ACQUIRE DATA BUS Figure 9. Using CS to Control Conversion and Read Timing t 10 R/C CS BYTE Hi-Z PINS Hi-Z PINS Figure 10. Using CS and BYTE to Control Data Bus Read Timing CONVERT ...

Page 11

... RMS amplitude of all other frequency components at the A/D output. The output is band limited to frequencies from above DC and below half the sampling frequency. A typical LTC1606 has a SINAD of 90dB and THD of –102dB with a 250kHz sampling rate and a 1kHz input. Total Harmonic Distortion ...

Page 12

... True 14-Bit Linearity, 81.5dB SINAD, 150mW Dissipation 0.075% Max, 10ppm/ C Max, Only 130 A Supply Current 0.04% Max, 3ppm/ C Max Serial I/O, 3V and 5V Versions 2.5V Input, 90dB SINAD, 100dB THD, No Missing Codes Pin Compatible 0V to 4V/ 4V Input Range, Pin Compatible with LTC1606 7.65 – 7.90 (0.301 – 0.311 1.73 – ...

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