Datasheet

AD7949 Data Sheet
Rev. D | Page 4 of 32
SPECIFICATIONS
VDD = 2.3 V to 5.5 V, VIO = 1.8 V to VDD, V
REF
= VDD, all specifications T
MIN
to T
MAX
, unless otherwise noted.
Table 2.
Parameter Conditions/Comments Min Typ Max Unit
RESOLUTION 14 Bits
ANALOG INPUT
Voltage Range Unipolar mode 0 +V
REF
V
Bipolar mode
−V
REF
/2
+V
REF
/2
Absolute Input Voltage Positive input, unipolar and bipolar modes −0.1 V
REF
+ 0.1 V
Negative or COM input, unipolar mode −0.1 +0.1
Negative or COM input, bipolar mode V
REF
/2 − 0.1 V
REF
/2 V
REF
/2 + 0.1
Analog Input CMRR f
IN
= 250 kHz 68 dB
Leakage Current at 25°C Acquisition phase 1 nA
Input Impedance
1
THROUGHPUT
Conversion Rate
Full Bandwidth
2
VDD = 4.5 V to 5.5 V
0
250
kSPS
VDD = 2.3 V to 4.5 V 0 200 kSPS
¼ Bandwidth
2
VDD = 4.5 V to 5.5 V 0 62.5 kSPS
VDD = 2.3 V to 4.5 V 0 50 kSPS
Transient Response Full-scale step, full bandwidth 1.8 μs
Full-scale step, ¼ bandwidth
14.5
μs
ACCURACY
No Missing Codes 14 Bits
Integral Linearity Error −1 ±0.5 +1 LSB
3
Differential Linearity Error −1 ±0.25 +1 LSB
Transition Noise REF = VDD = 5 V 0.1 LSB
Gain Error
4
−5 ±0.5 +5 LSB
Gain Error Match −1 ±0.2 +1 LSB
Gain Error Temperature Drift ±1 ppm/°C
Offset Error
4
±0.5
LSB
Offset Error Match −1 ±0.2 +1 LSB
Offset Error Temperature Drift ±1 ppm/°C
Power Supply Sensitivity
VDD = 5 V ± 5%
±0.2 LSB
AC ACCURACY
5
Dynamic Range 85.6 dB
6
Signal-to-Noise f
IN
= 20 kHz, V
REF
= 5 V 84.5 85.5 dB
f
IN
= 20 kHz, V
REF
= 4.096 V internal REF 85 dB
f
IN
= 20 kHz, V
REF
= 2.5 V internal REF 84 dB
SINAD f
IN
= 20 kHz, V
REF
= 5 V 84 85 dB
f
IN
= 20 kHz, V
REF
= 5 V, −60 dB input 33.5 dB
f
IN
= 20 kHz, V
REF
= 4.096 V internal REF 85 dB
f
IN
= 20 kHz, V
REF
= 2.5 V internal REF 84 dB
Total Harmonic Distortion
f
IN
= 20 kHz
−100
dB
Spurious-Free Dynamic Range f
IN
= 20 kHz 108 dB
Channel-to-Channel Crosstalk f
IN
= 100 kHz on adjacent channel(s) −125 dB
SAMPLING DYNAMICS
−3 dB Input Bandwidth Full bandwidth 1.7 MHz
¼ bandwidth 0.425 MHz
Aperture Delay VDD = 5 V 2.5 ns