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Analog Devices Semiconductor Electronic Components Datasheet

AD677 Datasheet

16-Bit 100 kSPS Sampling ADC

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AD677 pdf
a
FEATURES
Autocalibrating
On-Chip Sample-Hold Function
Serial Output
16 Bits No Missing Codes
؎1 LSB INL
–99 dB THD
92 dB S/(N+D)
1 MHz Full Power Bandwidth
16-Bit 100 kSPS
Sampling ADC
AD677
FUNCTIONAL BLOCK DIAGRAM
VIN 10
AGND SENSE 9
VREF 11
AGND 8
INPUT
BUFFERS
16-BIT
DAC
CAL
DAC
A CHIP
COMP
LOGIC TIMING
LEVEL TRANSLATORS
CAL 16
CLK 2
SAMPLE 1
MICROCODED
CONTROLLER
SAR
ALU
RAM
D CHIP
15 BUSY
14 SCLK
3 SDATA
AD677
PRODUCT DESCRIPTION
The AD677 is a multipurpose 16-bit serial output analog-to-
digital converter which utilizes a switched-capacitor/charge
redistribution architecture to achieve a 100 kSPS conversion
rate (10 µs total conversion time). Overall performance is opti-
mized by digitally correcting internal nonlinearities through
on-chip autocalibration.
The AD677 circuitry is segmented onto two monolithic chips—
a digital control chip fabricated on Analog Devices DSP CMOS
process and an analog ADC chip fabricated on our BiMOS II
process. Both chips are contained in a single package.
The AD677 is specified for ac (or “dynamic”) parameters such
as S/(N+D) Ratio, THD and IMD which are important in sig-
nal processing applications. In addition, dc parameters are
specified which are important in measurement applications.
The AD677 operates from +5 V and ± 12 V supplies and typi-
cally consumes 450 mW using a 10 V reference (360 mW with
5 V reference) during conversion. The digital supply (VDD) is
separated from the analog supplies (VCC, VEE) for reduced digi-
tal crosstalk. An analog ground sense is provided to remotely
sense the ground potential of the signal source. This can be use-
ful if the signal has to be carried some distance to the A/D con-
verter. Separate analog and digital grounds are also provided.
The AD677 is available in a 16-pin narrow plastic DIP, 16-pin
narrow side-brazed ceramic package, or 28-lead SOIC. A paral-
lel output version, the AD676, is available in a 28-pin ceramic
or plastic DIP. All models operate over a commercial tempera-
ture range of 0°C to +70°C or an industrial range of –40°C to
+85°C.
PRODUCT HIGHLIGHTS
1. Autocalibration provides excellent dc performance while
eliminating the need for user adjustments or additional exter-
nal circuitry.
2. ± 5 V to ± 10 V input range (± VREF).
3. Available in 16-pin 0.3" skinny DIP or 28-lead SOIC.
4. Easy serial interface to standard ADI DSPs.
5. TTL compatible inputs/outputs.
6. Excellent ac performance: –99 dB THD, 92 dB S/(N+D)
peak spurious –101 dB.
7. Industry leading dc performance: 1.0 LSB INL, ± 1 LSB full
scale and offset.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD677 Datasheet

16-Bit 100 kSPS Sampling ADC

No Preview Available !

AD677 pdf
AD677–SPECIFICATIONS
AC SPECIFICATIONS (TMIN to TMAX, VCC = +12 V ؎ 5%, VEE = –12 V ؎ 5%, VDD = +5 V ؎ 10%)1
Parameter
Total Harmonic Distortion (THD)2
@ 83 kSPS, TMIN to TMAX
@ 100 kSPS, +25°C
@ 100 kSPS, TMIN to TMAX
Signal-to-Noise and Distortion Ratio (S/(N+D))2, 3
@ 83 kSPS, TMIN to TMAX
@ 100 kSPS, +25°C
@ 100 kSPS, TMIN to TMAX
Peak Spurious or Peak Harmonic Component
Intermodulation Distortion (IMD)4
2nd Order Products
3rd Order Products
Full Power Bandwidth
Noise
AD677J/A
Min Typ
–97
–97
–93
89 91
89 91
89
–101
–102
–98
1
160
Max
–92
–92
AD677K/B
Min Typ Max
–99 –95
–99 –95
–95
90 92
90 92
90
–101
–102
–98
1
160
Units
dB
dB
dB
dB
dB
dB
dB
dB
dB
MHz
µV rms
DIGITAL SPECIFICATIONS (for all grades TMIN to TMAX, VCC = +12 V ؎ 5%, VEE = –12 V ؎ 5%, VDD = +5 V ؎ 10%)
Parameter
Test Conditions Min Typ Max
Units
LOGIC INPUTS
VIH High Level Input Voltage
VIL Low Level Input Voltage
IIH High Level Input Current
IIL Low Level Input Current
CIN Input Capacitance
VIH = VDD
VIL = 0 V
2.0
–0.3
–10
–10
10
VDD + 0.3
0.8
+10
+10
V
V
µA
µA
pF
LOGIC OUTPUTS
VOH High Level Output Voltage
VOL Low Level Output Voltage
IOH = 0.1 mA
IOH = 0.5 mA
IOL = 1.6 mA
VDD – 1 V
2.4
V
V
0.4 V
NOTES
1VREF = 10.0 V, Conversion Rate = 100 kSPS, flN = 1.0 kHz, VIN = –0.05 dB, Bandwidth = 50 kHz unless otherwise indicated. All measurements referred to a 0 dB
(20 V p-p) input signal. Values are post-calibration.
2For other input amplitudes, refer to Figure 12.
3For dynamic performance with different reference values see Figure 11.
4fa = 1008 Hz, fb = 1055 Hz. See Definition of Specifications section and Figure 16.
Specifications subject to change without notice.
–2– REV. A


Part Number AD677
Description 16-Bit 100 kSPS Sampling ADC
Maker Analog Devices
Total Page 16 Pages
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