Datasheet

AD7679
Rev. A | Page 3 of 28
SPECIFICATIONS
–40°C to +85°C, V
REF
= 4.096 V, AVDD = DVDD= 5 V, OVDD = 2.7 V to 5.25 V, unless otherwise noted.
Table 2.
Parameter Conditions Min Typ Max Unit
RESOLUTION 18 Bits
ANALOG INPUT
Voltage Range V
IN+
– V
IN–
–V
REF
+V
REF
V
Operating Input Voltage V
IN+
, V
IN–
to AGND –0.1 AVDD+0.1 V
Analog Input CMRR f
IN
= 100 kHz 68 dB
Input Current 570 kSPS Throughput 25 μA
Input Impedance
1
THROUGHPUT SPEED
Complete Cycle 1.75 μs
Throughput Rate 0 570 kSPS
DC ACCURACY
Integral Linearity Error –2.5 +2.5 LSB
2
Differential Linearity Error –1 +1.75 LSB
No Missing Codes 18 Bits
Transition Noise V
REF
= 5 V 0.7 LSB
Zero Error, T
MIN
to T
MAX
–40 +40 LSB
Zero Error Temperature Drift ±0.5 ppm/°C
Gain Error, T
MIN
to T
MAX
3
–0.048 See Note 3 +0.048 % of FSR
Gain Error Temperature Drift ±1.6 ppm/°C
Power Supply Sensitivity AVDD = 5 V ± 5% ±4 LSB
AC ACCURACY
Signal-to-Noise f
IN
= 2 kHz, V
REF
= 5 V 101 dB
4
V
REF
= 4.096 V 97.5 99 dB
f
IN
= 10 kHz, V
REF
= 4.096 V 98 dB
f
IN
= 100 kHz, V
REF
= 4.096 V 97 dB
Dynamic Range V
IN+
= V
IN–
= V
REF
/2 = 2.5 V 103 dB
Spurious-Free Dynamic Range f
IN
= 2 kHz 120 dB
f
IN
= 10 kHz 118 dB
f
IN
= 100 kHz 105 dB
Total Harmonic Distortion f
IN
= 2 kHz –115 dB
f
IN
= 10 kHz –113 dB
f
IN
= 100 kHz –98 dB
Signal-to-(Noise + Distortion) f
IN
= 2 kHz, V
REF
= 4.096 V 98 dB
f
IN
= 2 kHz, –60 dB Input 40 dB
–3 dB Input Bandwidth 26 MHz
SAMPLING DYNAMICS
Aperture Delay 2 ns
Aperture Jitter 5 ps rms
Transient Response Full-Scale Step 250 ns
Overvoltage Recovery 250 ns
REFERENCE
External Reference Voltage Range REF 3 4.096 AVDD + 0.1 V
REF Voltage with Reference Buffer REFBUFIN = 2.5 V 4.05 4.096 4.15 V
Reference Buffer Input Voltage Range REFBUFIN 1.8 2.5 2.6 V
REFBUFIN Input Current –1 +1 μA
REF Current Drain 570 kSPS Throughput 235 μA