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參數(shù)資料
| 型號： | AS1520-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | ADC |
| 英文描述： | 10-Bit, 8-Ch, 400ksps, ADC; Package Type: TSSOP-20 |
| 封裝： | TSSOP-20 |
| 文件頁數(shù)： | 14/29頁 |
| 文件大?。?/td> | 1043K |
| 代理商： | AS1520-T |
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www.austriamicrosystems.com
Revision 1.00
14 - 29
AS1520/AS1521
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 AS1520/AS1521 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 (AS1520) or 520ns (AS1521), and is calculated by:
tACQ = 7(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
CH4
CH5
CH6
CH7
COM
REF
AIN+
C
SWITCH
11pF
+
C
HOLD
13pF
–
Sample
Switch
C
SWITCH
includes all parasitics
Analog Input
Multiplexer
AIN-
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS1521-T | 10-Bit, 8-Ch, 300ksps, ADC; Package Type: TSSOP-20 |
| AS1523-T | 10-Bit, 4-Ch, 300ksps, ADC; Package Type: TSSOP-16 |
| AS1524-BTDT | μPower 12-Bit 1-CH 150ksps TD; Package Type: TDFN(3x3)-8 |
| AS1526-BSOT | 10-bit ADC 1-CH, 73ksps intRef; Package Type: SOIC-8 |
| AS1527-BSOT | 10-bit ADC, 1-Channel, 73ksps; Package Type: SOIC-8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS1521 | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:10-Bit, Single-Supply, Low-Power, 400/300ksps, 8-Channel A/D Converters |
| AS1521BTST | 制造商:AMS 功能描述:IC ADC 10BIT 300KSPS TSSOP-20 制造商:AMS 功能描述:IC, ADC, 10BIT, 300KSPS, TSSOP-20; Resolution (Bits):10bit; Sampling Rate:300kSPS; Supply Voltage Type:Single; Supply Voltage Min:4.5V; Supply Voltage Max:5.5V; Supply Current:2.7mA; Digital IC Case Style:TSSOP; No. of Pins:20 ;RoHS Compliant: Yes |
| AS1521-BTST | 功能描述:IC ADC 10BIT 8CH 300K 20-TSSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:250 系列:- 位數(shù):12 采樣率（每秒）:1.8M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:1.82W 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-LQFP 供應(yīng)商設(shè)備封裝:48-LQFP（7x7） 包裝:管件 輸入數(shù)目和類型:2 個單端，單極 |
| AS1521-BTSU | 制造商:AMSCO 制造商全稱:austriamicrosystems AG 功能描述:10-Bit, Single-Supply, Low-Power, 400/300ksps, 8-Channel A/D Converters |
| AS1521-T | 制造商:ams 功能描述:IC ADC 10BIT 8CH 300K 20-TSSOP 制造商:ams 功能描述:T&R / TSSOP 16 |
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