Typical rms noise at worst case transitions and temperatures.
3
Measured with fixed resistors as shown in Figures 11, 12 and 13. Adjustable to zero. Tested at room temperature.
4
Full-Scale Error is expressed as the % difference between the actual full-scale code transition voltage and the ideal full scale transition voltage, and includes the effect of offset
error. For bipolar input ranges, the Full-Scale Error is the worst case of either the –Full Scale or +Full Scale code transition voltage errors. For unipolar input ranges, Full-Scale
Error is with respect to the +Full-Scale code transition voltage.
5
External 2.5 V reference connected to REF.
6
f
IN
= 20 kHz, 0.5 dB down unless otherwise noted.
7
All specifications in dB are referred to a full scale
±
10 V input.
8
Full-Power Bandwidth is defined as full-scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60 dB, or 10 bits of accuracy.
9
Recovers to specified performance after a 2
×
F
S
input overvoltage.
Specifications subject to change without notice.
–2–
REV. D
AD977/AD977A
AD977A–SPECIFICATIONS
(–40 C to +85 C, F = 200 kHz, V
S
DIG
= V
ANA
= 5 V, unless otherwise noted)
Max
Min
16
C Grade
Typ Max
Unit
Bits
Parameter
RESOLUTION
ANALOG INPUT
Voltage Range
Impedance
Sampling Capacitance
THROUGHPUT SPEED
Complete Cycle
Throughput Rate
DC ACCURACY
Integral Linearity Error
Differential Linearity Error
No Missing Codes
Transition Noise
2
Full-Scale Error
3, 4
Full-Scale Error Drift
Full-Scale Error
Ext. REF = 2.5 V
Full-Scale Error Drift
Ext. REF = 2.5 V
Bipolar Zero Error
3
Bipolar Ranges
Bipolar Zero Error Drift
Bipolar Ranges
Unipolar Zero Error
3
Unipolar Ranges
Unipolar Zero Error Drift
Unipolar Ranges
Recovery to Rated Accuracy
After Power-Down
5
2.2
µF
to CAP
Power Supply Sensitivity
V
ANA
= V
DIG
= V
D
= 5 V
±
5%
AC ACCURACY
Spurious Free Dynamic Range
6
Total Harmonic Distortion
6
Signal-to-(Noise+Distortion)
6
–60 dB Input
Signal-to-Noise
6
Full Power Bandwidth
8
–3 dB Input Bandwidth
SAMPLING DYNAMICS
Aperture Delay
Transient Response, Full-Scale Step
Overvoltage Recovery
9
REFERENCE
Internal Reference Voltage
Internal Reference Source Current
External Reference Voltage Range
for Specified Linearity
External Reference Current Drain
Ext. REF = 2.5 V
Min
16
A Grade
Typ
Max
Min
16
B Grade
Typ
40
5
200
±
3
+3
1.0
±
7
±
0.5
±
0.5
±
2
±
10
±
2
±
10
±
2
1
±
8
90
–90
83
27
83
1
2.7
40
1
150
2.48
2.5
1
2.5
2.52
±
10 V, 0 V to 5 V, . . . (See Table II)
See Table II
40
5
200
±
2.0
+1.75
1.0
±
7
±
0.25
±
0.25
±
2
±
10
±
2
±
10
±
2
1
±
8
96
–96
85
28
85
1
2.7
40
1
150
2.48
2.5
1
2.5
2.52
2.48
83
83
90
200
40
5
pF
µs
kHz
LSB
1
LSB
Bits
LSB
%
ppm/°C
%
ppm/°C
±
15
mV
ppm/°C
±
10
mV
ppm/°C
–2
15
–1
16
±
3
±
2
15
1.0
±
7
±
0.5
±
0.5
±
2
±
2
±
2
1
±
8
ms
LSB
dB
7
dB
dB
dB
dB
MHz
MHz
ns
µs
ns
V
µA
V
mA
–90
27
1
2.7
40
1
150
2.5
1
2.5
2.52
2.3
2.7
1.2
2.3
2.7
1.2
2.3
2.7
1.2
NOTES
1
LSB means Least Significant Bit. With a
±
10 V input, one LSB is 305
µV.
2
Typical rms noise at worst case transitions and temperatures.
3
Measured with fixed resistors as shown in Figures 11, 12 and 13. Adjustable to zero. Tested at room temperature.
4
Full-Scale Error is expressed as the % difference between the actual full-scale code transition voltage and the ideal full scale transition voltage, and includes the effect of offset
error. For bipolar input ranges, the Full-Scale Error is the worst case of either the –Full Scale or +Full Scale code transition voltage errors. For unipolar input ranges, Full-Scale
Error is with respect to the +Full-Scale code transition voltage.
5
External 2.5 V reference connected to REF.
6
f
IN
= 20 kHz, 0.5 dB down unless otherwise noted.
7
All specifications in dB are referred to a full scale
±
10 V input.
8
Full-Power Bandwidth is defined as full-scale input frequency at which Signal-to-(Noise+Distortion) degrades to 60 dB, or 10 bits of accuracy.
9
Recovers to specified performance after a 2
×
F
S
input overvoltage.
Specifications subject to change without notice.
REV. D
–3–
AD977/AD977A–SPECIFICATIONS
(Both Specs)
Parameter
DIGITAL INPUTS
Logic Levels
V
IL
V
IH
I
IL
I
IH
DIGITAL OUTPUTS
Data Format
Data Coding
Pipeline Delay
V
OL
V
OH
POWER SUPPLIES
Specified Performance
V
DIG
V
ANA
I
DIG
I
ANA
Power Dissipation
PWRD LOW
PWRD HIGH
TEMPERATURE RANGE
Specified Performance
T
MIN
to T
MAX
Conditions
Min
A, B, C Grades
Typ
Max
Unit
–0.3
2.0
+0.8
V
DIG
+ 0.3
±
10
±
10
V
V
µA
µA
I
SINK
= 1.6 mA
I
SOURCE
= 500
µA
Serial 16-Bits
Binary Two’s Complement or Straight Binary
Conversion Results Only Available after Completed Conversion
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Microchip MCU
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