Datasheet

16-Bit, ±0.5 LSB, 500 kSPS PulSAR
®
Differential ADC in MSOP/QFN
AD7693
Rev. A
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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 @ 1 kHz
THD: −120 dB @ 1 kHz
True differential analog input range: ±V
REF
0 V to V
REF
with V
REF
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
Serial interface SPI®/QSPI™/MICROWIRE™/DSP compatible
Daisy-chain multiple ADCs, selectable busy indicator
Power dissipation: 40 nJ/conversion
40 μW @ 5 V/1 kSPS
4 mW @ 5 V/100 kSPS
18 mW @ 5 V/500 kSPS
Standby current: 1 nA
10-lead package: MSOP (MSOP-8 size) and
3 mm × 3 mm QFN (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
–1.0
0 65536
CODE
INL (LSB)
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
16384 32768 49152
POSITIVE INL = +0.17LSB
NEGATIVE INL = –0.17LSB
06394-001
Figure 1. Integral Nonlinearity vs. Code
APPLICATION DIAGRAM
AD7693
REF
GND
VDD
IN+
IN–
VIO
SDI
SCK
SDO
CNV
+1.8V TO VDD
3- OR 4-WIRE
INTERFACE
(SPI, DAISY CHAIN, CS)
+2.5V TO +5V
±10V, ±5V, ...
+5
V
ADA4941-1
0
6394-002
Figure 2.
Table 1. MSOP, QFN (LFCSP)/SOT-23
14-/16-/18-Bit PulSAR ADC
Type
100
kSPS
250
kSPS
400 kSPS
to
500 kSPS
ADC
Driver
18-Bit AD7691 AD7690
ADA4941-1
ADA4841-x
16-Bit True
Differential
AD7684 AD7687 AD7688
AD7693
ADA4941-1
ADA4841-x
16-Bit Pseudo AD7683 AD7685 AD7686 ADA4841-x
Differential/
Unipolar
AD7680 AD7694
14-Bit AD7940 AD7942 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, V
REF
, 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 V
REF
about V
REF
/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 QFN
(LFCSP) with operation specified from −40°C to +85°C.

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