The ADS1174 (quad) and ADS1178 (octal) are multiple delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with data rates up to 52k samples-per-second (SPS), which allow synchronous sampling of four and eight channels. These devices use identical packages, and are also compatible with the high-performance 24-bit ADS1274 and ADS1278, permitting drop-in upgrades.
The delta-sigma architecture offers near ideal 16-bit ac performance (97dB SNR, -105dB THD, 1LSB linearity) combined with 0.005dB passband ripple and linear phase response.
The high-order, chopper-stabilized modulator achieves very low drift (2µV/°C offset, 2ppm/°C gain) and low noise (1LSBPP). The on-chip finite impulse response (FIR) filter provides a usable signal bandwidth up to 90% of the Nyquist rate with 100dB of stop band attenuation while suppressing modulator and signal out-of-band noise.
Two operating modes allow for optimization of speed and power: High-speed mode (31mW/Ch at 52kSPS), and Low-power mode (7mW/Ch at 10kSPS).
A SYNC input control pin allows the device conversions to be started and synchronized to an external event. SPI and Frame-Sync serial interfaces are supported. The device is fully specified over the extended industrial range (40°C to +105°C) and is available in an HTQFP-64 PowerPAD package.
PowerPAD is a trademark of Texas Instruments.
SPI is a trademark of Motorola, Inc.
|Sample Rate (max) (SPS)|
|# Input Channels|
|Input Range (Min) (V)|
|Input Range (Max) (V)|
|Analog Voltage AV/DD (Min) (V)|
|Analog Voltage AV/DD (Max) (V)|
|Operating Temperature Range (C)|
|Approx. Price (US$)|
|THD (Typ) (dB)|
|INL (Max) (+/-LSB)|
|Simultaneous Sampling||Simultaneous Sampling||Simultaneous Sampling|
|Serial SPI||Serial SPI||Serial SPI||Serial SPI|
|-40 to 85||-40 to 85||-40 to 125||-40 to 105|
|8.80 | 1ku||6.30 | 1ku||14.65 | 1ku||25.15 | 1ku|
| Differential |
|Sample & Buy||Sample & Buy||Sample & Buy||Sample & Buy|