1 Features
1• Sample Rate: 1 MHz
• No Latency Output
• Unipolar, True-Differential Input Range:
–VREF to +VREF
• Wide Common-Mode Voltage Range:
0 V to VREF with 90-dB CMRR (min)
• SPI™-Compatible Serial Interface with
Daisy-Chain Option
• Excellent AC and DC Performance:
– ADS8881C:
INL: ±1 LSB (typ), ±2.0 LSB (max)
DNL: ±1.0 LSB (max), 18-Bit NMC
SNR: 100 dB, THD: –115 dB
– ADS8881I:
INL: ±1.5 LSB (typ), ±3.0 LSB (max)
DNL: +1.5 and –1 LSB (max), 18-Bit NMC
SNR: 100 dB, THD: –115 dB
• Wide Operating Range:
– AVDD: 2.7 V to 3.6 V
– DVDD: 2.7 V to 3.6 V
(Independent of AVDD)
– REF: 2.5 V to 5 V (Independent of AVDD)
– Operating Temperature:
ADS8881C : 0°C to +70°C
ADS8881I : –40°C to +85°C
• Low-Power Dissipation:
– 5.5 mW at 1 MSPS
– 0.55 mW at 100 kSPS
– 55 μW at 10 kSPS
• Power-Down Current (AVDD): 50 nA
• Full-Scale Step Settling to 18 Bits: 290 ns
• Packages: MSOP-10 and VSON-10

2 Applications
• Automatic Test Equipment (ATE)
• Instrumentation and Process Controls
• Precision Medical Equipment
• Low-Power, Battery-Operated Instruments

3 Description
The ADS8881 is an 18-bit, 1-MSPS, true-differential
input, analog-to-digital converter (ADC). The device
operates with a 2.5-V to 5-V external reference,
offering a wide selection of signal ranges without
additional input signal scaling. The reference voltage
setting is independent of, and can exceed, the analog
supply voltage (AVDD).
The device offers an SPI-compatible serial interface
that also supports daisy-chain operation for
cascading multiple devices. An optional busyindicator
bit makes synchronizing with the digital host
easy.
The device supports unipolar, true-differential analog
input signals with a differential input swing of –VREF to
VREF. This true-differential analog input structure
allows for a common-mode voltage of any value in
the range of 0 V to VREF (when both inputs are within
the operating input range of –0.1 V to VREF
+ 0.1 V).
Device operation is optimized for very low-power
operation. Power consumption directly scales with
speed. This feature makes the ADS8881 excellent for
lower-speed applications.