ADS8881 18-Bit, 1-MSPS, 1-ch SAR ADC with true-ifferential input, SPI interface and daisy-chain

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 busy-indicator bit makes synchronizing with the digital host easy.

The device supports unipolar, true-differential analog input signals with a differential input swing of –V_REF to V_REF. This true-differential analog input structure allows for a common-mode voltage of any value in the range of 0 V to V_REF (when both inputs are within the operating input range of –0.1 V to V_REF + 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.

Features

Sample Rate: 1 MHz
No Latency Output
Unipolar, True-Differential Input Range:
–V_REF to +V_REF
Wide Common-Mode Voltage Range:
0 V to V_REF 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

Parametrics

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Part number	Order	Resolution (Bits)	Sample rate (Max) (kSPS)	Number of input channels	Interface	Operating temperature range (C)	Package Group	Approx. price (US$)	Power consumption (Typ) (mW)	Package size: mm2:W x L (PKG)	Architecture	Input type	Reference mode	Features	Input range (Max) (V)	Input range (Min) (V)	Analog voltage AVDD (Min) (V)	Analog voltage AVDD (Max) (V)	Digital supply (Min) (V)	Digital supply (Max) (V)	INL (Max) (+/-LSB)	SNR (dB)	THD (Typ) (dB)	Rating
ADS8881	Order now	18	1000	1	SPI	-40 to 85 0 to 70	VSON \| 10 VSSOP \| 10	11.95 \| 1ku	5.5	10VSON: 9 mm2: 3 x 3 (VSON \| 10) 10VSSOP: 9 mm2: 3 x 3 (VSSOP \| 10)	SAR	Differential	Ext	Daisy-Chainable Oscillator Small Size	5	-5	2.7	3.6	1.65	3.6	2	100	-115	Catalog
ADS8900B	Order now	20	1000	1	Enhanced SPI SPI	-40 to 125	VQFN \| 24	24.95 \| 1ku	21	24VQFN: 16 mm2: 4 x 4 (VQFN \| 24)	SAR	Differential	Ext	Daisy-Chainable Oscillator	5	-5	3	5.5	1.65	5.5	3.9	104.5	-125	Catalog
ADS8902B	Order now	20	500	1	Enhanced SPI SPI	-40 to 125	VQFN \| 24	15.95 \| 1ku	16	24VQFN: 16 mm2: 4 x 4 (VQFN \| 24)	SAR	Differential	Ext	Daisy-Chainable Oscillator	5	-5	3	5.5	1.65	5.5	3.9	104.5	-125	Catalog

ADS8881 ACTIVE This product has been released to the market and is available for purchase. For some products, newer alternatives may be available. 18-Bit, 1-MSPS, 1-ch SAR ADC with true-ifferential input, SPI interface and daisy-chain

Description

Features

Parametrics

ADS8881
ACTIVE

This product has been released to the market and is available for purchase. For some products, newer alternatives may be available.

18-Bit, 1-MSPS, 1-ch SAR ADC with true-ifferential input, SPI interface and daisy-chain