參數(shù)資料
型號(hào)： THS0842EVM
廠商： Texas Instruments, Inc.
英文描述： THS0842EVM(THS0842評(píng)估板)
中文描述： THS0842EVM（THS0842評(píng)估板）
文件頁(yè)數(shù)： 14/37頁(yè)
文件大?。?/td> 516K
代理商： THS0842EVM
Circuit Function
2-2
2.1
Circuit Function
The following sections describe the function of individual circuits. Refer to the
relevant data sheet for device operating characteristics.
2.2
Analog Inputs
The ADC has either transformer-coupled single-ended or differential-analog
inputs. These are provided on the EVM via SMB connectors J8 and J11 for
single-ended inputs, or J9/J10 and J12/J13 for differential inputs, and can be
configured in two ways, as discussed in Sections 2.2.1 and 2.2.2.
2.2.1
Single-Ended Transformer Coupled Interface
Connectors J8 (Q) and J11 (I) are single-ended inputs that use a 1:1 transform-
er to provide differential analog inputs to the I+/I– and Q+/Q– inputs of U11
(THS0842). The signal input is nominally 0.89 Vpp.
W12, W13, W14, and W15 should be strapped across pins 2 and 3. The inputs
have 50-
terminators.
2.2.2
Differential Interface
Connectors J9 (Q+), J10 (Q–), J12 (I–), and J13 (I+) are used to connect ac-
coupled differential signals directly to U11 (THS0842). The signal input is nom-
inally a 0.44 Vpp.
W12, W13, W14, and W15 should be strapped across pins 1 and 2.
2.3
Digital Inputs
The THS0842 EVM utilizes jumpers for all digital inputs, with the exception of
the external clock. There are no connectors for setting the digital inputs. Refer
to the jumper table (Table 1–1 ) for a description of the jumpers and their func-
tion.
2.3.1
Internal Clock
The EVM provides flexibility as to the source of the ADC’s conversion clock.
This clock can come from an external signal generator, as described in Section
2.3.2, or by enabling onboard 80-MHz oscillator X1. Removing the shorting bar
from W3 will enable oscillator X1. Adding a shorting bar to jumper pins W6 will
direct clock oscillations from oscillator X1 to buffer amplifier U10A and to the
rest of the circuit. The EVM is shipped with external clock selected, W6 open,
and W3 shorted.
Note:
R49 must be removed to avoid loading the output of X1.
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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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