Changes to Ordering Guide .......................................................... 26
8/03—Revision 0: Initial Version
Rev. A | Page 2 of 28
AD7678
SPECIFICATIONS
Table 2. –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.
Parameter
RESOLUTION
ANALOG INPUT
Voltage Range
Operating Input Voltage
Analog Input CMRR
Input Current
Input Impedance
1
THROUGHPUT SPEED
Complete Cycle
Throughput Rate
DC ACCURACY
Integral Linearity Error
Differential Linearity Error
No Missing Codes
Transition Noise
Zero Error, T
MIN
to T
MAX
Zero Error Temperature Drift
Gain Error, T
MIN
to T
MAX3
Gain Error Temperature Drift
Power Supply Sensitivity
AC ACCURACY
Signal-to-Noise
Conditions
Min
18
–V
REF
–0.1
65
4
Typ
Max
Unit
Bits
V
V
dB
μA
V
IN+
– V
IN–
V
IN+
, V
IN–
to AGND
f
IN
= 100 kHz
100 kSPS Throughput
+V
REF
AVDD + 0.1
0
–2.5
–1
18
V
REF
= 5 V
–40
–0.048
AVDD = 5 V ± 5%
f
IN
= 2 kHz, V
REF
= 5 V
V
REF
= 4.096 V
f
IN
= 10 kHz, V
REF
= 4.096 V
f
IN
= 45 kHz, V
REF
= 4.096 V
V
IN+
= V
IN–
= V
REF
/2 = 2.5 V
f
IN
= 2 kHz
f
IN
= 10 kHz
f
IN
= 45 kHz
f
IN
= 2 kHz
f
IN
= 10 kHz
f
IN
= 45 kHz
f
IN
= 2 kHz
f
IN
= 2 kHz, –60 dB Input
±0.5
See Note 3
±1.6
±4
101
100
99.5
98
103
120
117
110
–118
–115
–110
100
41
900
2
5
Full-Scale Step
0.7
10
100
+2.5
+1.75
μs
kSPS
LSB
2
LSB
Bits
LSB
LSB
ppm/°C
% of FSR
ppm/°C
LSB
dB
4
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
kHz
ns
ps rms
μs
μs
V
V
V
μA
μA
±40
+0.048
98
Dynamic Range
Spurious-Free Dynamic Range
Total Harmonic Distortion
Signal-to-(Noise + Distortion)
–3 dB Input Bandwidth
SAMPLING DYNAMICS
Aperture Delay
Aperture Jitter
Transient Response
Overvoltage Recovery
REFERENCE
External Reference Voltage Range
REF Voltage with Reference Buffer
Reference Buffer Input Voltage Range
REFBUFIN Input Current
REF Current Drain
8.5
8.5
3
4.05
1.8
–1
4.096
4.096
2.5
42
AVDD + 0.1
4.15
2.6
+1
REF
REFBUFIN = 2.5 V
REFBUFIN
100 kSPS Throughput
Rev. A | Page 3 of 28
AD7678
Parameter
DIGITAL INPUTS
Logic Levels
V
IL
V
IH
I
IL
I
IH
DIGITAL OUTPUTS
Data Format
5
Pipeline Delay
6
V
OL
V
OH
POWER SUPPLIES
Specified Performance
AVDD
DVDD
OVDD
Operating Current
AVDD
DVDD
8
OVDD
8
Conditions
Min
Typ
Max
Unit
–0.3
2.0
–1
–1
+0.8
DVDD + 0.3
+1
+1
V
V
μA
μA
I
SINK
= 1.6 mA
I
SOURCE
= –500 μA
0.4
OVDD – 0.6
V
V
4.75
4.75
2.7
100 kSPS Throughput
PDBUF High
5
5
5.25
5.25
DVDD + 0.3
7
V
V
V
mA
mA
μA
mW
μW
mW
°C
PDBUF High @ 100 kSPS
PDBUF High @ 1 kSPS
PDBUF Low @ 100 kSPS
TEMPERATURE RANGE
9
Specified Performance
T
MIN
to T
MAX
–40
2.6
1
40
18
180
31
26
+85
1
2
See the Analog Inputs section.
LSB means Least Significant Bit. With the ±4.096 V input range, 1 LSB is 31.25 μV.
3
See the Definition of Specifications section. The nominal gain error is not centered at zero and is −0.029% of FSR. This specification is the deviation from this nominal
value. These specifications do not include the error contribution from the external reference, but do include the error contribution from the reference buffer if used.
4
All specifications in dB are referred to a full-scale input, FS. Tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
5
Data format parallel or serial 18-bit.
6
Conversion results are available immediately after completed conversion.
7
The maximum should be the minimum of 5.25 V and DVDD + 0.3 V.
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