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參數(shù)資料
| 型號： | SPT7935SCT |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PQFP44 |
| 封裝： | TQFP-44 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 77K |
| 代理商： | SPT7935SCT |
SPT
5
6/7/99
SPT7935
Figure 1 - Timing Diagram
N+8
N+7
N+6
N+2
N+1
N
N-1
tD
N-2
N-1
N
Sampling Points
tAP
AIN
CLK
DOUT
GENERAL DESCRIPTION
The SPT7935 is an ultra-low power, 12-bit, 20 MSPS ADC.
It has a pipelined architecture and incorporates digital error
correction of the 11 most significant bits. This error correction
ensures good linearity performance for input frequencies up
to Nyquist. The inputs are fully differential, making the device
insensitive to system-level noise. This device can also be
used in a single-ended mode. (See analog input section.)
With the power dissipation roughly proportional to the sam-
pling rate, this device is ideal for very low power applications
in the range of 1 to 20 MSPS.
TYPICAL INTERFACE CIRCUIT
The SPT7935 requires few external components to achieve
the stated operation and performance. Figure 2 shows the
typical interface requirements when using the SPT7935 in
normal circuit operation. The following sections provide a descrip-
tion of the functions and outline critical performance criteria to
consider for achieving the optimal device performance.
ANALOG INPUT
The input of the SPT7935 can be configured in various ways
depending on if a single-ended or differential, AC- or DC-
coupled input is desired.
GND
.01 F
+
4.7 F
Ref- In
(+1.15 V)
Ref+ In
(+2.15 V)
.01 F
+
10 F
0.1 F
+3.3 V
CLK In
(3 V Logic)
Interfacing
3 V Logic
Decoupling Cap
+3.3 V
DGND
FB
(MSB)
AGND
U1
SPT7935
.01 F
(+1.65 V)
Minicircuit
T1-6T
RF In
51
68 pF
22
23
11
12
34
33
1
44
(LSB)
N/C
GND
Bias1
Bias2
VCM
GND
VIN+
VIN-
GND
D11
D10
VDD3
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
GND
CLK
N/C
V
DD3
V
DD2
V
DD2
V
DD1
V
DD1
V
DD1
V
Ref
-
V
Ref
+
.01 F
+
4.7 F
+3.3 V Digital
9.5 A
90 A
Note: All VDD1, VDD2 and VDD3 should be tied together.
Figure 2 - Typical Interface Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SPT7935SCT_D | 功能描述:模數(shù)轉(zhuǎn)換器 - 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 |
| SPT7935SCTX | 功能描述:模數(shù)轉(zhuǎn)換器 - 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 |
| SPT7935SIT | 功能描述:模數(shù)轉(zhuǎn)換器 - 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 |
| SPT7935SITX | 功能描述:模數(shù)轉(zhuǎn)換器 - 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 |
| SPT7936 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:12-BIT, 28 MSPS SAMPLING A/D CONVERTER |
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