
Complete, High Speed
16-Bit A/D Converters
AD1376/AD1377
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.481.3113
2005 Analog Devices, Inc. All rights reserved.
FEATURES
Complete 16-bit converters with reference and clock
±0.003% maximum nonlinearity
No missing codes to 14 bits over temperature
Fast conversion
17 s to 16 bits (AD1376)
10 s to 16 bits (AD1377)
Short cycle capability
Adjustable clock rate
Parallel outputs
Low power
645 mW typical (AD1376)
585 mW typical (AD1377)
Industry-standard pinout
GENERAL DESCRIPTION
The AD1376/AD1377 are high resolution, 16-bit analog-to-
digital converters with internal reference, clock, and laser-
trimmed thin-film applications resistors. The AD1376/AD1377
are excellent for use in high resolution applications requiring
moderate speed and high accuracy or stability over commercial
temperature ranges (0°C to 70°C). They are packaged in
compact 32-lead, ceramic seam-sealed (hermetic), dual in-line
packages (DIP). Thin-film scaling resistors provide bipolar
input ranges of ±2.5 V, ±5 V, and ±10 V and unipolar input
ranges of 0 V to +5 V, 0 V to +10 V, and 0 V to +20 V.
Digital output data is provided in parallel form with
corresponding clock and status outputs. All digital inputs and
outputs are TTL-compatible.
For the AD1376, the serial output function is no longer
available after date code 0111. For the AD1377, the serial output
function is no longer available after date code 0210. The option
of applying an external clock on the CONVERT START pin to
slow down the internally set conversion time is no longer
supported for either part.
PRODUCT HIGHLIGHTS
1.
The AD1376/AD1377 provide 16-bit resolution with a
maximum linearity error of ±0.003% (1/2 LSB14) at 25°C.
2.
The AD1376 conversion time is 14 s (typical) short cycled
to 14 bits, and 16 s to 16 bits.
3.
The AD1377 conversion time is 8 s (typical) short cycled
to 14 bits, and 9 s to 16 bits.
4.
Two binary codes are available on the digital output. They
are CSB (complementary straight binary) for unipolar input
voltage ranges and COB (complementary offset binary) for
bipolar input ranges. Complementary twos complement
(CTC) coding may be obtained by inverting Pin 1 (MSB).
5.
The AD1376/AD1377 include internal reference and clock
with external clock rate adjust pin, and parallel digital outputs.
FUNCTIONAL BLOCK DIAGRAM
00
69
9-
0
1
(MSB) BIT 1 1
BIT 2 2
BIT 3 3
BIT 4 4
BIT 5 5
BIT 6 6
BIT 7 7
BIT 8 8
BIT 9 9
BIT 10 10
BIT 11 11
BIT 12 12
(LSB FOR 13 BITS) BIT 13 13
(LSB FOR 14 BITS) BIT 14 14
BIT 15 15
BIT 16 16
SHORT CYCLE
32
CONVERT START
31
+5V DC SUPPLY VL
30
GAIN ADJUST
29
+15V DC SUPPLY VCC
28
COMPARATOR IN
27
BIPOLAR OFFSET
26
+10V
25
+20V
24
CLK RATE CTRL
23
ANALOG COMMON
22
–15V DC SUPPLY VEE
21
CLOCK OUT
20
DIGITAL COMMON
19
STATUS
18
NC
17
16-
BI
T
DAC
16-BIT SAR
CLOCK
REFERENCE
COMPARATOR
7.5k
3.75k
3.75k
AD1376/AD1377
Figure 1.