Datasheet

ADS1672
www.ti.com SBAS402D –JUNE 2008–REVISED JULY 2010
ELECTRICAL CHARACTERISTICS
All specifications are at T
A
= –40°C to +85°C, AVDD = 5V, DVDD = 3V, f
CLK
= 20MHz, V
REF
= +3V, and R
BIAS
= 7.5kΩ,
unless otherwise noted.
ADS1672
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ANALOG INPUTS .
Full-scale input voltage V
IN
= (AINP – AINN) ±V
REF
V
Common-mode input voltage V
CM
= (AINP + AINN)/2 2.5 V
AC PERFORMANCE
Data rate (f
DATA
) See Table 2 kSPS
Inputs shorted together,
105 107
wide-bandwidth path, f
DATA
= 625kSPS
Dynamic range dB
Inputs shorted together,
wide-bandwidth path, f
DATA
= 113 115.5
78.125kSPS
f
IN
= 10kHz, –0.5dBFS,
102
wide-bandwidth path, f
DATA
= 625kSPS
f
IN
= 10kHz, –2dBFS,
Signal-to-noise ratio (SNR) 103 dB
wide-bandwidth path, f
DATA
= 625kSPS
f
IN
= 10kHz, –6dBFS,
99
wide-bandwidth path, f
DATA
= 625kSPS
f
IN
= 10kHz, –0.5dBFS –105
Total harmonic distortion (THD) f
IN
= 10kHz, –2dBFS –109 dB
f
IN
= 10kHz, –6dBFS –113
f
IN
= 10kHz, –0.5dBFS,
Spurious-free dynamic range (SFDR) –120 dB
signal harmonics excluded
DC PRECISION
Resolution 24 Bits
24-bit
Differential nonlinearity
(monotonic)
Integral nonlinearity Input range of ±0.5dBFS, T
A
= +25°C 3 9.5 ppm of FSR
Offset error –2 2 mV
Offset error drift 2 mV/°C
Gain error T
A
= +25°C 1 2 %
Gain error drift 2 ppm/°C
Noise See Noise Performance table (Table 2)
Common-mode rejection At dc 92 dB
Power-supply rejection At dc, AVDD 92 dB
DIGITAL FILTER CHARACTERISTICS (WIDE-BANDWIDTH PATH)
Passband 0 0.424f
DATA
Hz
Passband ripple ±0.0001 dB
–0.1dB attenuation 0.432f
DATA
Hz
Passband transition
–3.0dB attentuation 0.488f
DATA
Hz
f
CLK
–
Stop band 0.576f
DATA
Hz
0.576f
DATA
Stop band attenuation 86 dB
Group delay 28 t
DRDY
Settling time See Wide Bandwidth Filter section
DIGITAL FILTER CHARACTERISTICS (LOW-LATENCY PATH)
Bandwidth –3dB attenuation See Low-Latency Filter section
Settling time Complete settling 1 t
DRDY
VOLTAGE REFERENCE INPUTS
Reference input voltage (V
REF
) V
REF
= (VREFP – VREFN) 2.75 3.0 3.25 V
VREFP 2.75 3.0 3.25 V
VREFN Short to AGND V
Copyright © 2008–2010, Texas Instruments Incorporated Submit Documentation Feedback 3
Product Folder Link(s): ADS1672