Analog Input Jumper Description - Texas Instruments ADS62P EVM Series User Manual

Circuit Description
2.2.2.3 Power Supply Option 3
Option 3 is used to evaluate ADC performance using an isolated AVDD and DVDD power supply for
current-consumption measurements. This option must be used with caution, because reversing the power
supply or connecting to the wrong connector can damage the EVM. One common use of this option is to
measure the separate current consumption of the relative supplies under particular operating conditions.
For this option, the shunts on jumpers JP18 and JP15 are removed and the input power is supplied to the
center post of the jumper. For convenience, a ground post is provided next to the center post for header
connections that contain power and ground on 0.1" centers.
2.2.3 ADC Analog Inputs
The EVM can be configured to use either a transformer-coupled input or a TH4509 amplifier input, both
from a single-ended source. The SMA connector J6 (for Channel A) and J3 (for Channel B) provide the
single-ended analog input to the transformer-coupled input circuit to the ADC. The SMA connector J7 and
J9 are not installed by default, but can be used to bring a differential input clock to the
transformer-coupled input or to bring a single ended input to the THS4509 input circuit. To use the
transformer for one of these options, the EVM must be configured for one of the options listed in
See the schematic located at the end of this document prior to making any jumper changes.
EVM Banana Jack
J6
J3
J7
J9
SJP1
SJP2
SJP5
SJP3
SP3
12 ADS62PXXEVM
Table 4. Analog Input Jumper description
Description
Analog Input single-ended
Analog Input single-ended
Analog input, can be used with J6 for
differential input
Analog input, can be used with J3 for
differential input
AMPOUT+, +ve terminal of T4
AMPOUT-, -ve terminal of T4
INPUT -ve select
INPUT +ve select
Power down for amplifier THS4509
Jumper Setting
Not populated
Not populated
2-3 → AMPOUT+ is selected as source of input to ADC
1-2 → Use analog input from J3 as signal source to ADC
(use with appropriate SJP5 setting)
2-3 → AMPOUT- is selected as source of input to ADCC
1-2 → Use analog input from J9 as signal source to AD
(use with appropriate SJP3 setting
1-2 → J3 supplies the analog signal to ADC
2-3 → -ve input to amplifier
1-2 → J9 supplies the analog signal to ADC
2-3 → +ve input to amplifier DEFAULT is no shunt
1-2 → Pulls up the pin (Normal operation or amplifier is ON)
2-3 → Grounds the pin (Low-power mode or amplifier is off)
SLAU237A – May 2008 – Revised April 2009
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Table 5.