參數(shù)資料
型號(hào)： ADS7891
英文描述： CMOS Hex Schmitt Triggers 14-SO -55 to 125
中文描述： 3 MSPS的14位低功耗的SAR模數(shù)轉(zhuǎn)換器
文件頁(yè)數(shù)： 7/26頁(yè)
文件大?。?/td> 329K
代理商： ADS7891
SLAS410 DECEMBER 2003
www.ti.com
7
Terminal Functions
PIN
NAME
DATA BUS
BYTE =
I/O
DESCRIPTION
1623,
2631
8 BIT BUS
16 BIT BUS
0
0
1
16
DB13
O
D13 (MSB)
D5
D13 (MSB)
17
DB12
O
D12
D4
D12
18
DB11
O
D11
D3
D11
19
DB10
O
D10
D2
D10
20
DB9
O
D9
D1
D9
21
DB8
O
D8
D0 (LSB)
D8
22
DB7
O
D7
0
D7
23
DB6
O
D6
0
D6
26
DB5
O
D5
0
D5
27
DB4
O
D4
0
D4
28
DB3
O
D3
0
D3
29
DB2
O
D2
0
D2
30
DB1
O
D1
0
D1
31
DB0
O
D0 (LSB)
0
D0 (LSB)
36
BUSY
O
Status output. This pin is high when a conversion is in progress.
39
BYTE
I
Byte select input. Used for 8-bit bus reading.
0: No fold back.
1: Lower byte D[5:0] is folded back to high byte so D5 is available in D13 place.
40
CONVST
I
Conversion start. The rising edge starts the acquisition. The falling edge of this input ends the
acquisition and starts the conversion. Refer to the timing diagrams for more details.
41
RD
I
Active low synchronization pulse for the parallel output. When CS is low, this serves as the output
enable and puts the previous conversion results on the bus.
37
A_PWD
I
Nap mode enable, active low
24, 34
+VBD
Digital power supply for all digital inputs and outputs. Refer to Table 3 for layout guidelines.
25, 35
BDGND
Digital ground for all digital inputs and outputs. Needs to be shorted to analog ground plane below
the device.
42
CS
I
Chip Select. Active low signal enables chip operation like acquisition start, conversion start, bus
release from 3-state. Refer to the timing diagrams for more details.
38
PWD/RST
I
Active low input, acts as device power down/device reset signal.
5, 8, 11, 12, 14,
15, 44, 45
AGND
Analog ground pins. Need to be shorted to analog ground plane below the device.
4, 9, 10, 13, 43,
46
+VA
Analog power supplies. Refer to Table 3 for layout guidelines.
6
+IN
I
Non inverting analog input channel
7
IN
I
Inverting analog input channel
Reference (positive) input. Needs to be decoupled with REFM pin using 0.1-
μ
F bypass capacitor
and 1-
μ
F storage capacitor.
Internal reference output. To be shorted to REFIN pin when internal reference is used. Do not
connect to REFIN pin when external reference is used. Always needs to be decoupled with AGND
using 0.1-
μ
F bypass capacitor.
Reference ground. To be connected to analog ground plane.
1
REFIN
I
2
REFOUT
O
47, 48
REFM
I
3, 32, 33
NC
No connection pins.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7891EVM 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開(kāi)發(fā)工具 ADS7891 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類(lèi)型:ADC 工具用于評(píng)估:ADS130E08 接口類(lèi)型:SPI 工作電源電壓:- 6 V to + 6 V
ADS7891IPFBR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
ADS7891IPFBRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
ADS7891IPFBT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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
ADS7891IPFBTG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 2.7-5.25V Digital 5V Analog 14 Bit 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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