參數(shù)資料
型號： ADS7807PBG4
英文描述： Low-Power, 16-Bit, Sampling CMOS ANALOG-to-DIGITAL CONVERTER
中文描述： 低功耗，16位，采樣CMOS模擬數(shù)字轉(zhuǎn)換器
文件頁數(shù)： 7/24頁
文件大?。?/td> 534K
代理商： ADS7807PBG4
ADS7807
SBAS022C
7
www.ti.com
output valid data from the previous conversion on SDATA
(pin 19) synchronized to 16 clock pulses output on DATACLK
(pin 18).
BUSY
(pin 24) will go LOW and stay LOW until the
conversion is completed and the serial data has been trans-
mitted. Data will be output in BTC format, MSB first, and will
be valid on both the rising and falling edges of the data clock.
BUSY
going HIGH can be used to latch the data. All convert
commands will be ignored while
BUSY
is LOW.
The ADS7807 will begin tracking the input signal at the end
of the conversion. Allowing 25
μ
s between convert com-
mands assures accurate acquisition of a new signal.
The offset and gain are adjusted internally to allow external
trimming with a single supply. The external resistors compen-
sate for this adjustment and can be left out if the offset and
gain will be corrected in software (refer to the Calibration
section).
STARTING A CONVERSION
The combination of
CS
(pin 23) and
R/C
(pin 22) LOW for a
minimum of 40ns puts the sample-and-hold of the ADS7807
in the hold state and starts conversion
‘
n
’
.
BUSY
(pin 24) will
go LOW and stay LOW until conversion
‘
n
’
is completed and
the internal output register has been updated. All new con-
vert commands during
BUSY
LOW will be ignored.
CS
and/
or
R/C
must go HIGH before
BUSY
goes HIGH, or a new
conversion will be initiated without sufficient time to acquire
a new signal.
BASIC OPERATION
PARALLEL OUTPUT
Figure 1a shows a basic circuit to operate the ADS7807 with
a
±
10V input range and parallel output. Taking
R/C
(pin 22)
LOW for a minimum of 40ns (12
μ
s max) will initiate a
conversion.
BUSY
(pin 24) will go LOW and stay LOW until
the conversion is completed and the output register is up-
dated. If BYTE (pin 21) is LOW, the eight Most Significant
Bits (MSBs) will be valid when
BUSY
rises; if BYTE is HIGH,
the eight Least Significant Bits (LSBs) will be valid when
BUSY
rises. Data will be output in Binary Two
’
s Complement
(BTC) format.
BUSY
going HIGH can be used to latch the
data. After the first byte has been read, BYTE can be toggled
allowing the remaining byte to be read. All convert com-
mands will be ignored while
BUSY
is LOW.
The ADS7807 will begin tracking the input signal at the end
of the conversion. Allowing 25
μ
s between convert com-
mands assures accurate acquisition of a new signal.
The offset and gain are adjusted internally to allow external
trimming with a single supply. The external resistors compen-
sate for this adjustment and can be left out if the offset and gain
will be corrected in software (refer to the Calibration section).
SERIAL OUTPUT
Figure 1b shows a basic circuit to operate the ADS7807 with
a
±
10V input range and serial output. Taking
R/C
(pin 22)
LOW for 40ns (12
μ
s max) will initiate a conversion and
FIGURE 1a. Basic
±
10V Operation, both Parallel and Serial
Output.
FIGURE 1b. Basic
±
10V Operation with Serial Output.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
NC
(1)
NC
(1)
NC
(1)
NC
(1)
NC
(1)
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADS7807
Serial Output
200
66.5k
±
10V
+5V
0.1
μ
F
NC
(1)
NC
(1)
NC
(1)
10
μ
F
+
+5V
+
100
+
+
2.2
μ
F
2.2
μ
F
Convert Pulse
BUSY
40ns min
R/C
SDATA
DATACLK
NOTE: (1) These pins should be left unconnected.
They will be active when
R/C
is HIGH.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADS7807
Parallel Output
200
66.5k
±
10V
+5V
0.1
μ
F
NC
(1)
10
μ
F
+
+5V
+
100
B10
B9
B8
B2
B1
B0
(LSB)
B13 B12
B15
(MSB)
Pin 21
LOW
B14
B11
B5
B4
B7
Pin 21
HIGH
B6
B3
2.2
μ
F
+
+
2.2
μ
F
Convert Pulse
BUSY
R/C
BYTE
40ns min
NOTE: (1) SDATA (pin 19) is always active.
相關(guān)PDF資料
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ADS7807PG4 Low-Power, 16-Bit, Sampling CMOS ANALOG-to-DIGITAL CONVERTER
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADS7807PG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U/1K 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U/1KE4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
ADS7807U/1KG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power 16-Bit Sampling CMOS 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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
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