This evaluation board contains the LMP7312, along with a SPI command generator to program the registers in the LMP7312 .Connectors, JUMPERS Jumpers, Test Point The eval board has 6 jumpers: POWER SUPPLY +Vs banana plug for the positive power supply of the LMP7312 and the onboard SPI command generator. VIO banana plug to power the SPI of the LMP7312 when an external micro is used to program the SPI. GND banana plug for ground connection. SIGNAL CONNECTORS J1 connects the CSB pin of the LMP7312 to either the onboard SPI commands generator or to pin 1 of J7. J2 connects the SCK pin of the LMP7312 to either the onboard SPI commands generator or to pin 3 of J7. J3 connects the SDI pin of the LMP7312 to either the onboard SPI commands generator or to pin 5 of J7. J4 connects the -VOUT/VR pin of the LMP7312 either to the VR reference or to the LOAD. (see the Output Configuration section). J5 connects the VOCM pin of the LMP7312 to either the ground or to the VOCM reference. (see the Output Configuration section). J6 connects the VIO pin of the LMP7312 to either the +Vs plug or to the VIO plug. Input signals +IN_CL banana plug for non-inverting input of the amplification pair. -IN_CL banana plug for inverting input of the amplification pair. +IN_LS BNC for non-inverting input of the attenuation pair. -IN_LS BNC for inverting attenuation pair. J7 14-pin header available for microcontroller connection. The pin out is shown in Table 3. input of TEST POINTS the The test points are connected as follows: TP1 TP2 TP3 TP4 TP5 TP6 TP7 TP8 TP9 TP10 TP11 Reference Signals Vocm banana plug for the common mode output signals and the output configuration (single ended, differential). See the Output Configuration section. VR banana plug for the output reference when the output of the LMP7312 is used in single ended mode. Output signals OUT- BNC for the inverting Output in the differential output configuration OUT+ BNC for the non-inverting output. DP Differential Probe Header connector. P1 5-pin header for ADC141S626 or ADC161S626 Eval Board connection. 1 GND -IN pin -VIN pin -VOUT/VR pin +IN pin +VIN pin +VOUT pin VR VOCM +Vs VIO LMP7312 Evaluation Board User Guide (551600360-001 REV A) LMP7312 Evaluation Board User Guide (551600360-001 REV A) * REGISTER PROGRAMMING SETUP Single ended mode * Short jumper J4 * Short pin2 and pin3 of J5 * Connect a supply in the range between 0V and 5V between VR and GND banana plugs In order to use the on board SPI commands generator to program the LMP7312 the following jumpers need to be configured as follows: J1 open J2 open J3 open J6 short pin1 to pin 2 Connect a supply in the range between 1V and 5V to the +Vocm and GND banana plugs COMPONENTS If the device is configured in the differential output mode, the series resistances R2 and R3, RLd and the capacitance CLd can be changed in order to build a first order low pass filter with desired bandwidth. In this configuration the capacitance CLs and the resistance RLs should be removed. If the device is configured in the single-ended output mode, the series resistance R3, RLs and capacitance CLs can be changed in order to build a first order low pass filter with desired bandwidth. In this configuration the capacitance CLd and the resistance RLd should be removed. If the value of the shunt resistance R1 does not fit the application needs, replace it as needed In order to use a microcontroller to program the LMP7312 the following jumpers need to be configured as follows: J1 short J2 short J3 short J6 short pin2 to pin 3 Connect the external microcontroller to J7. Refer to Table 3 for J7 pin out. POWER SUPPLY SETUP When the LMP7312 is programmed through the onboard SPI command generator, a 5V supply is needed to power the eval board: * Connect a +5V supply to the +Vs and GND banana plugs Using the Board INPUT AND OUTPUT SIGNALS When the LMP7312 is programmed through a microcontroller: * Connect a +5V supply between +Vs and GND banana plugs * Connect a supply (2.7V - 5.5V) that matches microcontroller voltage range between +VIO and GND banana plugs Attenuation mode Connect a signal at +IN_LS and -IN_LS BNC; refer to the Datasheet for the allowed amplitude according to the set gain. Amplification mode Connect a signal at +IN_CL and -IN_CL banana; refer to the Datasheet for the allowed amplitude according to the set gain. SOURCE SETUP Attenuation input pair If signal source impedance matching is desired, solder the resistors R8 and R9 of appropriate value. PROGRAMMING THE LMP7312 The register in the LMP7312 can be programmed using switches S1 and S2. S2 consists of five switches labeled B0, B1, B2, B3, B4, corresponding to the five bits of the LMP7312 register. If the switch is up a "0" is programmed to the corresponding bit. S1 is used to load the data into the register of the LMP7312. For example, to load the gain of 0.384V/V set S2 as follows: Gain_1 - Down 1 Gain_0 - Up 0 EN_CL - Up 0 Null_SW - Up 0 HiZ - Up 0 Then Push the switch S1 to load the data into the register of the LMP7312. Table 1 shows the allowed register values. Amplification input pair The 50 shunt resistor (R1) between the inputs needs to be removed if the amplification input pair is not used as a current loop receiver. OUTPUT CONFIGURATION The LMP7312 is able to work in both single ended and differential output mode. The selection of the output is made through the Vocm (output common mode voltage) pin. Differential mode * Open jumper J4 * Short pin1 and pin2 of J5 2 LMP7312 Evaluation Board User Guide (551600360-001 REV A) Hardware Setup LSB MSB HI_Z NULL_SW EN_CL Gain_0 Gain_1 Gain Value (V/V) Mode of Operation 0 0 0 0 0 0.096 Attenuation 0 0 0 1 0 0.192 Attenuation 0 0 0 0 1 0.384 Attenuation 0 0 0 1 1 0.768 Attenuation 0 0 1 0 1 1 Amplification 0 0 1 1 1 2 Amplification 1 x x x x - High Impedance output 0 1 x x x 1 Null Switch mode Table 2 S2 Dip switch description PINS 1-2 3-4 5-6 7-8 9-10 Table 3 J7 connector description NAME Hiz Null_SW EN_CL Gain_0 Gain_1 PIN 1 2 3 4 5 6 7 WRITING TO THE REGISTER USING A MICROCONTROLLER NAME CSB GND SCK NC SDI NC SDO PIN 8 9 10 11 12 13 14 NAME NC NC NC NC NC NC NC Interfacing ADC Eval Board A microcontroller can be used to program the LMP7312. If the microcontroller is provided with a TTL logic signal connect pin1 and pin2 of J6 together, otherwise, apply a voltage compliant with the microcontroller logic value to the VIO banana plug, and short pin2 and pin3 of J6. The microcontroller signals are connected to the LMP7312 through J7. More information on the SPI configuration is provided in the SPI section of the LMP7312 datasheet. The LMP7312 Eval Board can be interfaced with the ADC141S626 and ADC161S626 Eval Boards through the P1 connector only when the LMP7312 is configured in the differential output mode (see Output Configuration section). Table 4 P1 connector description PIN NAME 3 1 Vs 2 GND 3 OUT- 4 GND 5 OUT+ LMP7312 Evaluation Board User Guide (551600360-001 REV A) Table 1 Register Values LMP7312 Evaluation Board User Guide (551600360-001 REV A) Schematic 4 Top layer Bottom layer 5 LMP7312 Evaluation Board User Guide (551600360-001 REV A) Board Layout IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI's terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI's standard warranty. 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