16-Bit, 100 kSPS PulSAR,
Differential ADC in MSOP
AD7684
FEATURES
APPLICATION DIAGRAM
0.5V TO VDD 2.7V TO 5.5V
16-bit resolution with no missing codes
Throughput: 100 kSPS
V
REF
0
INL: 1 LSB typical, 3 LSB maximum
True differential analog input range: VREF
0 V to VREF with VREF up to VDD on both inputs
Single-supply operation: 2.7 V to 5.5 V
Serial interface SPI®-/QSPI-™/MICROWIRE-™/DSP-compatible
Power dissipation
REF
VDD
+IN
–IN
DCLOCK
3-WIRE SPI
INTERFACE
AD7684
D
OUT
CS
V
GND
REF
0
Figure 1.
4 mW @ 5 V
1.5 mW @ 2.7 V
150 μW @ 2.7 V/10 kSPS
Standby current: 1 nA
8-lead MSOP package
Table 1. MSOP, QFN (LFCSP)/SOT-23
14-/16-/18-Bit PulSAR ADC
400 kSPS
to
100
250
≥ 1000
ADC
Driver
Type
kSPS
kSPS
500 kSPS kSPS
18-Bit True
Differential
16-Bit True
Differential
AD7691 AD7690
AD7982 ADA4941
AD7984 ADA4841
ADA4941
APPLICATIONS
AD7684 AD7687 AD7688
AD7693
Battery-powered equipment
Data acquisition
Instrumentation
Medical instruments
Process control
ADA4841
16-Bit Pseudo AD7680 AD7685 AD7686
Differential AD7683 AD7694
AD7980 ADA4841
14-Bit Pseudo AD7940 AD7942 AD7946
Differential
ADA4841
GENERAL DESCRIPTION
The AD7684 is a 16-bit, charge redistribution, successive
approximation, PulSAR® analog-to-digital converter (ADC)
that operates from a single power supply, VDD, between 2.7 V
to 5.5 V. It contains a low power, high speed, 16-bit sampling
ADC with no missing codes, an internal conversion clock, and a
serial, SPI-compatible interface port. The part also contains a low
noise, wide bandwidth, short aperture delay, track-and-hold circuit.
On the
falling edge, it samples the voltage difference
CS
between +IN and –IN pins. The reference voltage, REF, is
applied externally and can be set up to the supply voltage. Its
power scales linearly with throughput.
The AD7684 is housed in an 8-lead MSOP, with an operating
temperature specified from −40°C to +85°C.
Rev. A
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 registeredtrademarks arethe 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: 781.461.3113 ©2004–2007 Analog Devices, Inc. All rights reserved.