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參數(shù)資料
| 型號： | THS0842EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | THS0842EVM(THS0842評估板) |
| 中文描述： | THS0842EVM（THS0842評估板） |
| 文件頁數(shù)： | 16/37頁 |
| 文件大小： | 516K |
| 代理商： | THS0842EVM |
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Circuit Function
2-4
Table 2–2.Daughtercard Connector J5
J2 Pin
Name
Function
J2 Pin
Name
Function
1
DB0
Q
OUT
0
2
DGND
Ground
3
DB1
Q
OUT
1
4
DGND
Ground
5
DB2
Q
OUT
2
6
DGND
Ground
7
DB3
Q
OUT
3
8
DGND
Ground
9
DB4
Q
OUT
4
10
DGND
Ground
11
DB5
Q
OUT
5
12
DGND
Ground
13
DB6
Q
OUT
6
14
DGND
Ground
15
DB7
Q
OUT
7
16
DGND
Ground
17
RSVD
NC
18
DGND
Ground
19
RSVD
NC
20
DGND
Ground
21
COUT
COUT clock
22
DGND
Ground
23
COUT
COUT clock
24
DGND
Ground
25
80 MHz
80-MHz clock
26
DGND
Ground
2.6
References
The EVM can use either the THS0842 internal reference, a tunable external
reference generated on the EVM board, or a customer-provided external
reference.
The THS0842’s input range is determined by the voltages on its V
REFB
and
V
REFT
pins. Since the part has an internal-voltage reference generator, it must
be powered down (W4 removed) before applying an external voltage to the
REFT and REFB pins. It is advantageous to have a wider analog input range,
especially at higher sampling rates. This can be achieved by using external
voltage references. For example, at AV
DD
= 3.3 V, the full-scale range can be
extended from 1 Vpp (internal reference) to 1.3 Vpp (external reference), as
shown in Table 3–3. These voltages should notbe derived from a power-
supply source via a voltage divider. Use instead a bandgap-derived voltage
reference to derive both references via an operational-amplifier circuit. Refer
to the schematic of the THS0842 evaluation module for an example circuit.
The full-scale ADC input range and its dc position can be adjusted when using
external references. The full-scale ADC range is always equal to V
REFT
–
VREFB. The maximum full-scale range is dependent on AVDD, as shown in
the THS0842 data sheet specifications section. Aside from the constraint on
their difference, there are limitations on the useful range of V
REFT
and V
REFB
individually, depending on the value of AV
DD
. Table 3–3 summarizes these
limits for three cases.
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| THS0842IPFB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 40MSPS Dual Ch 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 |
| THS0842IPFBG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 8-Bit 40MSPS Dual Ch 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 |
| THS0842PFB | 制造商:TI 制造商全稱:Texas Instruments 功能描述:DUAL-INPUT, 8-BIT, 40 MSPS LOW-POWER ANALOG-TO-DIGITAL CONVERTER WITH SINGLE OR DUAL PARALLEL BUS OUTPUT |
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