ADS1625IPAPT ,18 Bit, 1.25MSPS Single Channel Delta-Sigma ADC SingleFEATURES DESCRIPTION Data Rate: 1.25MSPSThe ADS1625 and ADS1626 are high-speed, high-precision, S ..
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ADS1625IPAPT
18 Bit, 1.25MSPS Single Channel Delta-Sigma ADC Single
SBAS280E − JUNE 2003 − REVISED MAY 2007
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FEATURES Data Rate: 1.25MSPS Signal-to-Noise Ratio: 93dB Total Harmonic Distortion: −101dB Spurious-Free Dynamic Range: 103dB Linear Phase with 615kHz Bandwidth Passband Ripple: ±0.0025dB Adjustable FIFO Output Buffer (ADS1626 only) Selectable On-Chip Reference Directly Connects to TMS320C6000 DSPs Adjustable Power Dissipation: 150 to 515mW Power Down Mode Supplies: Analog +5V
Digital +3V
Digital I/O +2.7V to +5.25V
APPLICATIONS Scientific Instruments Automated Test Equipment Data Acquisition Medical Imaging Vibration Analysis
DESCRIPTIONThe ADS1625 and ADS1626 are high-speed, high-precision,
delta-sigma analog-to-digital converters (ADCs) with 18-bit
resolution. The data rate is 1.25 mega samples per second
(MSPS), the bandwidth (−3dB) is 615kHz, and passband
ripple is less than ±0.0025dB (to 550kHz). Both devices offer
the same outstanding performance at these speeds with a
signal-to-noise ratio up to 93dB, total harmonic distortion
down to −101dB, and a spurious-free dynamic range up to
103dB. The ADS1626 includes an adjustable first-in, first-out
buffer (FIFO) for the output data.
The input signal is measured against a voltage reference that
can be generated on-chip or supplied externally. The digital
output data are provided over a simple parallel interface that
easily connects to digital signal processors (DSPs). An
out-of-range monitor reports when the input range has been
exceeded. The ADS1625/6 operate from a +5V analog
supply (AVDD) and +3V digital supply (DVDD). The digital
I/O supply (IOVDD) operates from +2.7 to +5.25V, enabling
the digital interface to support a range of logic families. The
analog power dissipation is set by an external resistor and
can be reduced when operating at slower speeds. A
power-down mode, activated by a digital I/O pin, shuts down
all circuitry. The ADS1625/6 are offered in a TQFP-64
package using TI PowerPAD technology.
The ADS1625 and ADS1626, along with their 16-bit,
5MSPS counterparts, the ADS1605 and ADS1606, are
well-suited for the demanding measurement requirements
of scientific instrumentation, automated test equipment,
data acquisition, and medical imaging.
REFEN
VREFP VREFN RBIASVMID VCAP AVDD DVDD IOVDD
DGNDAGND
AINP
AINN
CLK
RESET
DRDY
DOUT[17:0]
FIFO_LEV[2:0]
OTR
