AD7915 Datasheet, PDF (1/26 Pages) Analog Devices – 16-Bit, 1 MSPS/500 kSPS Differential PulSAR ADCs

Data Sheet
16-Bit, 1 MSPS/500 kSPS
Differential PulSAR ADCs
AD7915/AD7916
FEATURES
Low power dissipation
AD7915
4 mW at 1 MSPS (VDD only)
7 mW at 1 MSPS (total)
AD7916
2 mW at 500 kSPS (VDD only)
3.7 mW at 500 kSPS (total)
16-bit resolution with no missing codes
Throughput: 1 MSPS (AD7915)/500 kSPS (AD7916)
INL: ±0.4 LSB typical, ±1 LSB maximum
SNR: 94 dB at 1 kHz, VREF = 5 V
SINAD: 93.5 dB at 1 kHz, VREF = 5 V
THD: −118.5 dB at 1 kHz
Dynamic range: 95.5 dB, VREF = 5 V
True differential analog input range: ±VREF
0 V to VREF with VREF between 2.4 V and 5.1 V
No pipeline delay
Single-supply 2.5 V operation with 1.8 V/2.5 V/3 V/5 V logic
interface
Proprietary serial interface: SPI-/QSPI-/MICROWIRE™-/DSP-
compatible¹
Ability to daisy-chain multiple ADCs
10-lead packages: MSOP and 3 mm × 3 mm LFCSP
APPLICATIONS
Battery-powered equipment
Data acquisition systems
Medical instruments
Seismic data acquisition systems
GENERAL DESCRIPTION
The AD7915/AD7916 are 16-bit, successive approximation,
analog-to-digital converters (ADCs) that operate from a single
power supply, VDD. They contain a low power, high speed,
16-bit sampling ADC and a versatile serial interface port. On
the CNV rising edge, the AD7915/AD7916 sample the voltage
difference between the IN+ and IN− pins. The voltages on these
pins typically swing in opposite phases between 0 V and VREF.
The reference voltage, REF, is applied externally and can be set
independent of the supply voltage, VDD. The power consumption
of the AD7915/AD7916 scales linearly with throughput.
The AD7915/AD7916 are serial peripheral interface (SPI)
compatible, which features the ability, using the SDI input, to
daisy-chain several ADCs on a single 3-wire bus. They are
compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic using the
separate VIO supply.
The AD7915/AD7916 are available in a 10-lead MSOP or a
10-lead LFCSP with operation specified from −40°C to +125°C.
Table 1. MSOP, LFCSP 14-/16-/18-Bit PulSAR® ADCs
Bits 100 kSPS 250 kSPS 400 kSPS to 500 kSPS ≥1000 kSPS
18¹ AD7989-1² AD7691² AD7690²
AD7982²
AD7989-5²
AD7984²
16¹ AD7684 AD7687² AD7688²
AD7915²
AD7693²
AD7916²
16³ AD7680
AD7683
AD7685² AD7686²
AD7694 AD7988-5²
AD7980²
AD7983²
AD7988-1²
14³ AD7940 AD7942² AD7946²
1 _{True differential.}
2 _{Pin-for-pin compatible.}
3 _{Pseudo differential.}
TYPICAL APPLICATIONS CIRCUIT
2.5V TO 5V 2.5V
1 _{Protected by U.S. Patent 6,703,961.}
±10V, ±5V, ..
ADA4940-1
REF VDD ^VIO
IN+
SDI/CS
AD7915/
AD7916
IN–
GND
SCK
SDO
CNV
Figure 1.
1.8V TO 5.5V
3- OR 4-WIRE
INTERFACE
(SPI, CS,
DAISY CHAIN)
Rev. 0
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