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| 型号： | 5962-9169101MXA |
| 厂商： | CRYSTAL SEMICONDUCTOR CORP |
| 元件分类： | ADC |
| 英文描述： | 2-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP28 |
| 封装： | CERDIP-28 |
| 文件页数： | 13/48页 |
| 文件大小： | 647K |
| 代理商： | 5962-9169101MXA |
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be tied to the same source, as CH1/2 is reconfig-
ured as an output.)
ANALOG CIRCUIT CONNECTIONS
Most popular successive approximation A/D con-
verters generate dynamic loads at their analog
connections. The CS5101A and CS5102A inter-
nally buffer all analog inputs (AIN1, AIN2,
VREF, and AGND) to ease the demands placed
on external circuitry. However, accurate system
operation still requires careful attention to details
at the design stage regarding source impedances
as well as grounding and decoupling schemes.
Reference Considerations
An application note titled "Voltage References for
the CS501X Series of A/D Converters" is avail-
able for the CS5101A and CS5102A. In addition to
working through a reference circuit design example,
it offers several built-and-tested reference circuits.
During conversion, each capacitor of the cali-
brated capacitor array is switched between VREF
and AGND in a manner determined by the suc-
cessive-approximation algorithm. The charging
and discharging of the array results in a current
lo ad at th e reference. The CS5101A and
CS5102A each include an internal buffer ampli-
fier to minimize the external reference circuit’s
drive requirement and preserve the reference’s in-
tegrity. Whenever the array is switched during
conversion, the buffer is used to coarse-charge
the array thereby providing the bulk of the neces-
sary charge. The appropriate array capacitors are
then switched to the unbuffered VREF pin to avoid
any errors due to offsets and/or noise in the buffer.
The external reference circuitry need only pro-
vide the residual charge required to fully charge
the array after coarse-charging from the buffer.
This creates an ac current load as the CS5101A
and CS5102A sequence through conversions. The
reference circuitry must have a low enough out-
put impedance to drive the requisite current
without changing its output voltage significantly.
As the analog input signal varies, the switching
sequence of the internal capacitor array changes.
The current load on the external reference cir-
cuitry thus varies in response with the analog
input. Therefore, the external reference must not
exhibit significant peaking in its output imped-
ance characteristic at signal frequencies or their
harmonics.
A large capacitor connected between VREF and
AGND can provide sufficiently low output im-
pedance at the high end of the frequency
spectrum, while almost all precision references
exhibit extremely low output impedance at dc.
The presence of large capacitors on the output of
some voltage references, however, may cause
peaking in the output impedance at intermediate
frequencies. Care should be exercised to ensure
that significant peaking does not exist or that
some form of compensation is provided to elimi-
nate the effect.
The magnitude of the current load on the external
reference circuitry will scale to the master clock
frequency. At the full-rated 9.216 MHz clock
(CS5101A), the reference must supply a maxi-
mum load current of 20
A peak-to-peak (2 A
typical). An output impedance of 2
will there-
fore yield a maximum error of 40
V. At the
full-rated 2.0 MHz clock (CS5102A), the refer-
C
R
+5V
1N4148
CS5102A
CS5101A
OR
VD+
RST
____
Figure 8. Power-up Reset Circuit
CS5101A CS5102A
20
DS45F2
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| 5962-9169102MXA | 2-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP28 |
| 5962-9169201M3A | 2-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CQCC28 |
| 5962-9169202M3A | 2-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CQCC28 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 5962-9169301M2A | 制造商:Texas Instruments 功能描述:-LIFETIME BUYS TIL 03/03 |
| 5962-9169701MMA | 制造商:e2v Aerospace & Defense 功能描述:SMD MKD 87C51RC-16 PHI-JLCC |
| 5962-9169701MUA | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intel 功能描述: |
| 5962-9169702MUA | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 5962-9172201MEA | 制造商:e2v 功能描述:Counter Single 4-Bit Binary UP 16-Pin CDIP 制造商:e2v technologies 功能描述:Counter Single 4-Bit Binary UP 16-Pin CDIP |
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