AD7693_15 Datasheet, PDF (1/24 Pages) Analog Devices – Differential ADC in MSOP/LFCSP

Data Sheet
16-Bit, ±0.5 LSB, 500 kSPS PulSAR^®
Differential ADC in MSOP/LFCSP
AD7693
FEATURES
16-bit resolution with no missing codes
Throughput: 500 kSPS
INL/DNL: ±0.25 LSB typ, ±0.5 LSB max (±8 ppm of FSR)
Dynamic range: 96.5 dB
SINAD: 96 dB at 1 kHz
THD: −120 dB at 1 kHz
True differential analog input range: ±VREF
0 V to VREF with VREF up to VDD on both inputs
No pipeline delay
Single-supply 5 V operation with
1.8 V/2.5 V/3 V/5 V logic interface
Proprietary serial interface
SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible¹
Daisy-chain multiple ADCs, selectable busy indicator
Power dissipation: 40 nJ/conversion
40 µW at 5 V/1 kSPS
4 mW at 5 V/100 kSPS
18 mW at 5 V/500 kSPS
Standby current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
3 mm × 3 mm LFCSP (SOT-23 size)
Pin-for-pin compatible with the 16-bit AD7687 and AD7688
and the 18-bit AD7690 and AD7691
APPLICATIONS
Battery-powered equipment
Data acquisitions
Seismic data acquisition systems
DVMs
Instrumentation
Medical instruments
1.0
POSITIVE INL = +0.17LSB
NEGATIVE INL = –0.17LSB
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
16384
32768
49152
CODE
Figure 1. Integral Nonlinearity vs. Code
65536
APPLICATION DIAGRAM
+2.5V TO +5V +5V
±10V, ±5V, ...
ADA4941-1
REF VDD ^VIO
IN+
SDI
AD7693 ^SCK
IN–
GND
SDO
CNV
+1.8V TO VDD
3- OR 4-WIRE
INTERFACE
(SPI, DAISY CHAIN, CS)
Figure 2.
Table 1. MSOP, LFCSP/SOT-23
14-/16-/18-Bit PulSAR ADC
Type
18-Bit
100
kSPS
250
kSPS
AD7691
16-Bit True
Differential
16-Bit Pseudo
Differential/
Unipolar
14-Bit
AD7684
AD7683
AD7680
AD7940
AD7687
AD7685
AD7694
AD7942
400 kSPS
to
500 kSPS
AD7690
AD7688
AD7693
AD7686
ADC
Driver
ADA4941-1
ADA4841-x
ADA4941-1
ADA4841-x
ADA4841-x
AD7946 ADA4841-x
GENERAL DESCRIPTION
The AD7693 is a 16-bit, successive approximation analog-to-
digital converter (ADC) that operates from a single power supply,
VDD. It contains a low power, high speed, 16-bit sampling ADC
with no missing codes, an internal conversion clock, and a
versatile serial interface port. The reference voltage, VREF, is
applied externally and can be set up to the supply voltage, VDD.
On the CNV rising edge, it samples the voltage difference
between the IN+ and IN− pins. The voltages on these pins
swing in opposite phase between 0 V and VREF about VREF/2.
Its power scales linearly with throughput.
Using the SDI input, the SPI-compatible serial interface also
features the ability to daisy-chain several ADCs on a single
3-wire bus and provides an optional busy indicator. It is compatible
with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate VIO supply.
The AD7693 is housed in a 10-lead MSOP or a 10-lead LFCSP
with operation specified from −40°C to +85°C.
1 _{Protected by U.S. Patent 6,703,961.}
Rev. B
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