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参数资料
| 型号： | ADMOD79 |
| 厂商： | Analog Devices, Inc. |
| 英文描述： | Dual-Channel ∑△ Modulator(双通道∑△调制器) |
| 中文描述： | 双通道Σ△调制器（双通道Σ△调制器） |
| 文件页数： | 1/8页 |
| 文件大小： | 131K |
| 代理商： | ADMOD79 |
One Technology Way, P.O. Box 9106, Norwood. MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
FUNCT IONAL BLOCK DIAGRAM
REFERENCE
DAC
DAC
VINL+
VINL–
LOUT
ROUT
DAC
DAC
VINR+
VINR–
∫
∫
∫
∫
∫
∫
∫
∫
∫
∫
∫
REV. 0
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.
a
Dual-Channel
∑
Modulator
ADM0D79*
dynamic range and excellent common-mode rejection character-
istics. Because its modulator is single-bit, the ADMOD79 is
inherently monotonic and has no mechanism for producing
differential linearity errors. Analog and digital supply connec-
tions are separated to isolate the analog circuitry from the digital
supplies.
T he ADMOD79 is fabricated in a BiCMOS process and is
supplied in a 0.6" wide 28-lead cerdip package. T he
ADMOD79 operates from
±
5 V power supplies over the
temperature range of –25
°
C to +70
°
C.
PRODUCT OVE RVIE W
T he ADMOD79 Sigma-Delta (
∑
) modulator is a building
block which can be used to build a superior analog-to-digital
conversion system customized to a particular application’s
requirement. T he ADMOD79 is a two-channel, fully differen-
tial modulator. Each channel consists of a fifth-order one-bit
noise shaping modulator. An on-chip voltage reference provides
a voltage source to both channels that is stable over temperature
and time. T here are separate single-bit digital outputs for each
channel. T he ADMOD79 accepts a 64
×
F
input master clock
(SMPCLK ) that can range from 2.5 kHz to 3.57 MHz.
Input signals are sampled at 64
×
F
on switched-capacitors,
eliminating external sample-and-hold amplifiers and minimizing
the requirements for antialias filtering at the input. With
simplified antialiasing, linear phase can be preserved across the
passband. T he ADMOD79’s proprietary fifth-order differential
switched-capacitor modulator architecture shapes the one-bit
comparator’s quantization noise out of the passband. T he high
order of the modulator randomizes the modulator output,
reducing idle tones in the output spectrum to very low levels.
T he ADMOD79’s differential architecture provides increased
*
Protected by U.S. Patent Numbers 5055843, 5126653, and others pending.
FEATURES
High-Performance
∑
ADC Building Block
Fifth-Order, 64 Times Oversampling Modulator with
Patented Noise-Shaping
Modulator Clock Rate to 3.57 MHz
103 dB Dynamic Range (for 20 kHz Input
Bandwidth)
Differential Architecture for Superior SNR and Dynamic
Range
Dual-Channel Differential Analog Inputs (
±
6.2 V
Differential Input Voltage)
On-Chip Voltage Reference
APPLICATIONS
Digital Audio
Medical Electronics
Electronic Imaging
Sonar Signal Processing
Instrumentation
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