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參數(shù)資料
| 型號(hào)： | ADS8509IBDBRG4 |
| 英文描述： | GT 19C 19#12 PIN RECP BOX |
| 中文描述： | 16位250 ksps的串行CMOS采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 18/26頁 |
| 文件大?。?/td> | 693K |
| 代理商： | ADS8509IBDBRG4 |
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External
DATACLK
.
2
3
4
35
34
36
17
16
20
21
19
1
Null
D
Q
A00
D
Q
Null
D
Q
B00
D
Q
A15
D
Q
A16
D
Q
B15
D
Q
B16
D
Q
TAG(A)
TAG(B)
DATA (A)
DATA (B)
DATACLK
(both A & B)
SYNC
(both A & B)
(both A & B)
DATA ( B )
Nth Conversion Data
Null
B
B15
A15
B00
B13
B14
B01
A00
A14
A13
A01
DATA ( A )
A15
A00
A13
A14
A01
18
Null
A
Null
A
ADS8509A
TAG
DCS
R/C
DATACLK
ADS8509B
TAG
DATA
CS
R/C
DATACLK
Processor
SCLK
SDI
TAG(A) = 0
TAG(A) = 0
R/C
BUSY
EXT/INT tied high, CS of both converter A and B, TAG input of converter A are tied low.
ANALOG INPUTS
The ADS8509 has six analog input ranges as shown in
Table 3
. The offset and gain specifications are factory
calibrated with 0.1%, -W, external resistors as shown in
Figure 29
and
Figure 30
. The external resistors can be
omitted if larger gain and offset errors are acceptable or if using software calibration. The hardware trim circuitry
shown in
Figure 29
and
Figure 30
can reduce the errors to zero.
ADS8509
SLAS324A–OCTOBER 2004–REVISED JUNE 2005
Figure 27. Timing of TAG Feature With Single Conversion (Using External DATACLK)
The analog input pins R1
IN
, R2
IN
, and R3
IN
have ±25-V overvoltage protection. The input signal must be
referenced to AGND1. This will minimized the ground loop problem typical to analog designs. The analog input
should be driven by a low impedance source. A typical driving circuit using OPA627 or OPA132 is shown in
Figure 28
.
The ADS8509 can operate with its internal 2.5-V reference or an external reference. An external reference
connected to pin 6 (REF) bypasses the internal reference. The external reference must drive the 4-k
resistor
that separates pin 6 from the internal reference (see the illustration on page 1). The load will vary with the
difference between the internal and external reference voltages. The external reference voltage can vary from
2.3 V to 2.7 V. The internal reference will be approximately 2.5 V. The reference, whether internal or external, is
buffered internally with a buffer with its output on pin 5 (CAP).
The ADS8509 is factory tested with 2.2-μF capacitors connected to pins 5 and 6 (CAP and REF). Each capacitor
should be placed as close as possible to its pin. The capacitor on pin 6 band limits the internal reference noise. A
smaller capacitor can be used but it may degrade SNR and SINAD. The capacitor on pin 5 stabilizes the
reference buffer and provides switching charge to the CDAC during conversion. Capacitors smaller than 1 μF
can cause the buffer to become unstable may not hold sufficient charge for the CDAC. The parts are tested to
specifications with 2.2 μF so larger capacitors are not necessary. The equivalent series resistor (ESR) of these
compensation capacitors is also critical. Keep the total ESR under 3
. See the TYPICAL CHARACTERISTICS
section concerning how ESR affects performance.
Neither the internal reference nor the buffer should be used to drive an external load. Such loading can degrade
performance. Any load on the internal reference causes a voltage drop across the 4-k
resistor and will affect
gain. The internal buffer is capable of driving ±2-mA loads but any load can cause perturbations of the reference
at the CDAC, degrading performance. It should be pointed out that, unlike other competitor’s parts with similar
input structure, the ADS8509 does not require a second high speed amplifier used as buffer to isolate the CAP
pin from the signal dependent current in the R3
IN
pin but can tolerate it if one do exist.
18
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS8509 | 16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| ADS8509IBDB | 16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| ADS8509IBDBR | 16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| ADS8509IDWRG4 | 16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
| ADS8509IBDW | 16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS8509IBDW | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz CMOS w/Serial Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS8509IBDW | 制造商:Texas Instruments 功能描述:CONVERTER ((NW)) |
| ADS8509IBDWG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz CMOS w/Serial Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS8509IBDWR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz CMOS w/Serial Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| ADS8509IBDWRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16-Bit 250kHz CMOS w/Serial Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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