Datasheet

AD977/AD977A
–2–
REV. D
A Grade B Grade C Grade
Parameter Min Typ Max Min Typ Max Min Typ Max Unit
RESOLUTION 16 16 16 Bits
ANALOG INPUT
Voltage Range ±10 V, 0 V to 5 V, . . . (See Table II)
Impedance See Table II
Sampling Capacitance 40 40 40 pF
THROUGHPUT SPEED
Complete Cycle 10 10 10 µs
Throughput Rate 100 100 100 kHz
DC ACCURACY
Integral Linearity Error ± 3 ± 2.0 ± 3 LSB
1
Differential Linearity Error –2 +3 –1 +1.75 ± 2 LSB
No Missing Codes 15 16 15 Bits
Transition Noise
2
1.0 1.0 1.0 LSB
Full-Scale Error
3, 4
± 0.5 ± 0.25 ± 0.5 %
Full-Scale Error Drift ±7 ±7 ± 7 ppm/°C
Full-Scale Error
Ext. REF = 2.5 V ± 0.5 ± 0.25 ± 0.5 %
Full-Scale Error Drift
Ext. REF = 2.5 V ±2 ±2 ±2 ppm/°C
Bipolar Zero Error
3
Bipolar Ranges ± 10 ± 10 ± 15 mV
Bipolar Zero Error Drift
Bipolar Ranges ±2 ±2 ±2 ppm/°C
Unipolar Zero Error
3
Unipolar Ranges ± 10 ± 10 ± 10 mV
Unipolar Zero Error Drift
Unipolar Ranges ± 2 ± 2 ± 2 ppm/°C
Recovery to Rated Accuracy
After Power-Down
5
2.2 µF to CAP 1 1 1 ms
Power Supply Sensitivity
V
ANA
= V
DIG
= V
D
= 5 V ± 5% ± 8 ± 8 ± 8 LSB
AC ACCURACY
Spurious Free Dynamic Range
6
90 96 90 dB
7
Total Harmonic Distortion
6
–90 –96 –90 dB
Signal-to-(Noise+Distortion)
6
83 85 83 dB
–60 dB Input 27 28 27 dB
Signal-to-Noise
6
83 85 83 dB
Full Power Bandwidth
8
700 700 700 kHz
–3 dB Input Bandwidth 1.5 1.5 1.5 MHz
SAMPLING DYNAMICS
Aperture Delay 40 40 40 ns
Transient Response, Full-Scale Step 2 2 2 µs
Overvoltage Recovery
9
150 150 150 ns
REFERENCE
Internal Reference Voltage 2.48 2.5 2.52 2.48 2.5 2.52 2.48 2.5 2.52 V
Internal Reference Source Current 1 1 1 µA
External Reference Voltage Range
for Specified Linearity 2.3 2.5 2.7 2.3 2.5 2.7 2.3 2.5 2.7 V
External Reference Current Drain
Ext. REF = 2.5 V 100 100 100 µA
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.
AD977–SPECIFICATIONS
(–40C to +85C, F
S
= 100 kHz, V
DIG
= V
ANA
= 5 V, unless otherwise noted)