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參數(shù)資料
| 型號(hào)： | AS1533-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | ADC |
| 英文描述： | 12-Bit, 4-CH, ADC, 300ksps; Package Type: TSSOP-16 |
| 封裝： | TSSOP-16 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 920K |
| 代理商： | AS1533-T |
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www.austriamicrosystems.com
Revision 1.00
14 - 28
AS1532/AS1533
Data Sheet
- Detailed Description
8 Detailed Description
Analog Input
The equivalent input circuit (
Figure 20
) shows the input architecture: track/hold circuitry, input multiplexer, input com-
parator, switched-capacitor DAC, and internal reference. A flexible serial interface provides easy connections to vari-
ous microprocessors.
Figure 20. Equivalent Input Circuit
The input tracking circuitry has a 6MHz small-signal bandwidth, thus it is possible to under-sample (digitize high-speed
transient events) and measure periodic signals modulated at frequencies exceeding the AS1532/AS1533 sampling
rate.
Note:
To avoid high-frequency signals being aliased into the frequency band of interest, antialias filtering is recom-
mended
Input Protection
Internal protection diodes (which clamp the analog input to V
DD1
and GND) allow the channel inputs to swing from
(GND to 0.3V) to (V
DD1
+ 0.3V) without damaging the devices. However, for accurate conversions near full scale, the
inputs must not exceed V
DD1
by more than 50mV or be lower than GND by 50mV.
Note:
If the analog input exceeds 50mV beyond the supply voltage, do not allow the input current to exceed 2mA.
Track/Hold
The track/hold stage enters tracking mode on the rising edge of SCLK which clocks in bit MODE of the 8-bit control
byte (see
Figure 21 on page 17
). The track/hold stage enters hold mode on the falling clock edge after bit PD0 of the 8-
bit control byte has been shifted in.
The time required for the track/hold circuit to acquire an input signal is a function of how quickly the input capacitance
is charged. If the input signal source impedance is high, the acquisition time lengthens. The acquisition time (t
ACQ
) is
the maximum time the device takes to acquire the signal and is also the minimum time needed for the signal to be
acquired.
t
ACQ
is never less than 390ns (AS1532) or 520ns (AS1533), and is calculated by:
tACQ = 9(RS + RIN)18pF
(EQ 1)
Where:
:
R
IN
= 800
Ω
R
S
= the source impedance of the input signal.
Note:
Source impedances below 2k
Ω
do not significantly affect the AC performance of the devices.
+
–
+
Comparator
R
IN
C
SWITCH
11pF
C
HOLD
13pF
–
CH0
CH1
CH2
CH3
COM
REF
AIN+
C
SWITCH
11pF
+
C
HOLD
13pF
–
Sample
Switch
C
SWITCH
includes all parasitics
Analog Input
Multiplexer
AIN-
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS1534 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:12-bit, 8-Channel, Low-Power, 200ksps A/D Converter |
| AS1536 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:12-Bit, Single Supply, Low-Power, 73ksps A/D Converters |
| AS15360204PD | 制造商:Raltron Electronics Corporation 功能描述: |
| AS15360FLF | 制造商:TT Electronics / IRC 功能描述:AS15360FLF |
| AS15360HLF | 制造商:TT Electronics / IRC 功能描述:AS15360HLF |
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