
16-Bit, 1 MSPS PulSAR ADC in MSOP/QFN
Data Sheet
AD7980
Rev. C
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FEATURES
16-bit resolution with no missing codes
Throughput: 1 MSPS
Low power dissipation
4 mW at 1 MSPS (VDD only)
7 mW at 1 MSPS (total)
70 W at 10 kSPS
INL: ±0.6 LSB typical, ±1.25 LSB maximum
SINAD: 91.25 dB at 10 kHz
THD: 110 dB at 10 kHz
Pseudo differential analog input range
0 V to VREF with VREF between 2.5 V to 5.5 V
Any input range and easy to drive with the ADA4841
No pipeline delay
Single-supply 2.5 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 and busy indicator
10-lead MSOP and 10-lead, 3 mm × 3 mm, QFN (LFCSP),
same space as SOT-23
Wide operating temperature range: 40°C to +125°C
APPLICATIONS
Battery-powered equipment
Communications
ATE
Data acquisitions
Medical instruments
APPLICATION DIAGRAM EXAMPLE
AD7980
REF
GND
VDD
IN+
IN–
VIO
SDI
SCK
SDO
CNV
1.8V TO 5V
3- OR 4-WIRE INTERFACE
(SPI, DAISY CHAIN, CS)
2.5V TO 5V
2.5V
0 TO VREF
06392-
001
Figure 1.
GENERAL DESCRIPTION
The AD7980 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 and a versatile serial interface port. On the CNV
rising edge, it samples an analog input IN+ between 0 V to REF
with respect to a ground sense IN. The reference voltage, REF,
is applied externally and can be set independent of the supply
voltage, VDD. Its power scales linearly with throughput.
The SPI-compatible serial interface also features the ability,
using the SDI input, 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 supply VIO.
The AD7980 is housed in a 10-lead MSOP or a 10-lead QFN
(LFCSP) with operation specified from 40°C to +125°C.
Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR ADC
Type
100 kSPS
250 kSPS
400 kSPS to 500 kSPS
1000 kSPS
ADC Driver
18-Bit
16-Bit
14-Bit
1
Pin-for-pin compatible.