Features: 16-bit resolution with no missing codes
Throughput: 250 kSPS
INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR)
Dynamic range: 96.5 dB
S/(N + D): 95.5 dB @ 20 kHz
THD: −118 dB @ 20 kHz
True differential analog input range
±VREF
0 V to VREF with VREF up to VDD on both inputs
No pipeline delay
Single-supply 2.3 V to 5.5 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
Power dissipation
1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS, and
1.4 µW @ 2.5 V/100 SPS
Standby current: 1 nA
10-lead MSOP (MSOP-8 size) and
3 mm * 3 mm QFN1 (LFCSP) (SOT-23 size)
Pin-for-pin compatible with AD7685, AD7686, and AD7688ApplicationBattery-powered equipment
Data acquisitions
Instrumentation
Medical instruments
Process controlsPinout
Specifications
| Parameter |
Rating |
Analog Inputs
IN+1, IN−1
REF
Supply Voltages
VDD, VIO to GND
VDD to VIO
Digital Inputs to GND
Digital Outputs to GND
Storage Temperature Range
Junction Temperature
JA Thermal Impedance
JC Thermal Impedance
Lead Temperature Range |
GND − 0.3 V to VDD + 0.3 V
or ±130 mA
GND − 0.3 V to VDD + 0.3 V
−0.3 V to +7 V
±7 V
−0.3 V to VIO + 0.3 V
−0.3 V to VIO + 0.3 V
−65°C to +150°C
150°C
200°C/W (MSOP-10)
44°C/W (MSOP-10)
JEDEC J-STD-20 |
| Resolution (Bits) |
16bit |
| T-Put Rate |
250kSPS |
| # Chan |
1 |
| Supply V |
Single(+2.3 to +5.5),Single(+2.5),Single(+3),Single(+3.3),Single(+5) |
| Pwr Diss |
12.5mW |
| Interface |
Ser,SPI |
| Ain Range |
(2Vref) p-p |
| SNR (dB) |
95.5dB |
| Pkg Type |
CSP,SOP |
DescriptionThe AD7687 is a 16-bit, charge redistribution, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 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 versatile serial interface port. The part also contains a low noise, wide bandwidth, short aperture delay track-and-hold circuit. On the CNV rising edge, it samples the voltage difference between IN+ and IN− pins. The voltages on these pins usually swing in opposite phase between 0 V to REF. The reference voltage, REF, is applied externally and can be set up to the supply voltage.
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 AD7687 is housed in a 10-lead MSOP or a 10-lead QFN1 (LFCSP) with operation specified from −40°C to +85°C.
AD7687 Data Sheet
