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參數(shù)資料
| 型號： | ADS7861E |
| 英文描述： | CMOS 4-Bit-by-16-Word FIFO Register 16-PDIP -55 to 125 |
| 中文描述： | 雙通道，為500kHz，12位，2通道，同步采樣模擬數(shù)字轉(zhuǎn)換器 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大小： | 226K |
| 代理商： | ADS7861E |
10
ADS7861
Code (decimal)
8000
7000
6000
5000
4000
3000
2000
1000
0
N
2044
2045
2046
2047
2048
FIGURE 5. Histogram of 8,000 Conversions of a DC Input.
FIGURE 6. Test Circuits for Timing Specifications.
FIGURE 7. Level Shift Circuit for Bipolar Input Ranges.
TRANSITION NOISE
Figure 5 shows a histogram plot for the ADS7861 following
8,000 conversions of a DC input. The DC input was set at
output code 2046. All but one of the conversions had an
output code result of 2046 (one of the conversions resulted
in an output of 2047). The histogram reveals the excellent
noise performance of the ADS7861.
BIPOLAR INPUTS
The differential inputs of the ADS7861 were designed to
accept bipolar inputs (–V
REF
and +V
REF
) around the internal
reference voltage (2.5V), which corresponds to a 0V to 5V
input range with a 2.5V reference. By using a simple op amp
circuit featuring a single amplifier and four external resis-
tors, the ADS7861 can be configured to except bipolar
inputs. The conventional
±
2.5V,
±
5V, and
±
10V input
ranges can be interfaced to the ADS7861 using the resistor
values shown in Figure 7.
TIMING AND CONTROL
The operation of the ADS7861 can be configured in four
different modes by using the address pins M0 (pin 14), M1
(pin 15) and A0 (pin 16).
The M0 pin selects between two- and four-channel operation
(in two-channel operation, the A0 pin selects between Chan-
nels 0 and 1; in four-channel operation the A0 pin is ignored
and the channels are switched automatically after each
conversion). The M1 pin selects between having serial data
transmitted simultaneously on both the Serial A data output
(pin 23) and the Serial B data output (pin 22) or having both
channels output data through the Serial A port. The A0 pin
selects either Channel 0 or Channel 1 (see Pin Descriptions
and Serial Output Truth Table for more information).
The next four sections will explain the four different modes
of operation.
Mode I (M0 = 0, M1 = 0)
With the M0 and M1 pins both set to ‘0’, the ADS7861 will
operate in two-channel operation (the A0 pin must be used
to switch between Channels A and B). A conversion is
initiated by bringing CONVST HIGH for a minimum of
15ns. It is very important that CONVST be brought HIGH
a minimum of 10ns prior to a rising edge of the external
clock or 5ns after the rising edge. If CONVST is brought
R
1
R
2
+IN
–IN
REF
OUT
(pin 2)
2.5V
4k
20k
Bipolar Input
BIPOLAR INPUT
±
10V
±
5V
±
2.5V
R
1
1k
2k
4k
R
2
5k
10k
20k
OPA132
ADS7861
DATA
1.4V
Test Point
3k
100pF
C
LOAD
t
R
DATA
Voltage Waveforms for DATA Rise and Fall Times t
R
, and t
F
.
V
OH
V
OL
t
F
DESCRIPTION
ANALOG INPUT
Full-Scale Input Span
–V
REF
to +V
REF(1)
Least Significant
Bit (LSB)
(–V
REF
to +V
REF
)/4096
(2)
+Full Scale
4.99878V
0111 1111 1111
7FF
Midscale
2.5V
0000 0000 0000
000
Midscale – 1 LSB
2.49878V
1111 1111 1111
FFF
–Full Scale
0V
1000 0000 0000
800
NOTES: (1) –V
to +V
around V
. With a 2.5V reference, this corre-
sponds to a 0V to 5V input span. (2) 1.22mV with a 2.5V reference.
TABLE I. Ideal Input Voltages and Output Codes.
DIGITAL OUTPUT
BINARY TWO’S COMPLEMENT
BINARY CODE
HEX CODE
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PDF描述 |
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| ADS7861EB | CMOS 4-Bit-by-16-Word FIFO Register 16-PDIP -55 to 125 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7861E | 制造商:BURR-BROWN 功能描述:12BIT ADC DUAL SMD 7861 SSOP24 制造商:Texas Instruments 功能描述:Analog-Digital Converter IC Number of Bi |
| ADS7861E/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual 500kHz 2+2 Ch Simltns Smplng ADC 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 |
| ADS7861E/2K5G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual 500kHz 2+2 Ch Simltns Smplng ADC 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 |
| ADS7861EB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Dual 500kHz 2+2 Ch Simltns Smplng ADC 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 |
| ADS7861EB | 制造商:Texas Instruments 功能描述:Analog/Digital Converter IC Number of Bi |
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