SBOU231 October   2020 OPA3S328

 

  1.   Trademarks
  2. 1Overview
    1. 1.1 Related Documentation
    2. 1.2 Electrostatic Discharge Caution
  3. 2EVM Circuit Description
  4. 3Jumper Settings
  5. 4Power-Supply Connections
  6. 5Input and Output Connections
  7. 6Modifications
  8. 7Schematic, PCB Layout, and Bill of Materials
    1. 7.1 Schematic
    2. 7.2 PCB Layout
    3. 7.3 Bill of Materials

3 Jumper Settings

Figure 3-1 details the default jumper settings of the OPA3S328EVM. Table 3-1 explains the configuration for these jumpers.

GUID-20201006-CA0I-VMCC-TZJR-1WCDZBXLWTSZ-low.pngFigure 3-1 OPA3S328EVM Default Jumper Settings
Table 3-1 Default Jumper Configuration
JumperFunctionDefault PositionDescription
J11V- Supply Select Shunt 2-3Shunt 2–3: Selects AGND as V- for unipolar supply configuration
Shunt 1–2: Selects Ext V- supply for bipolar supply configuration
J16Int DGND / Ext DGND:
Site 1 		Shunt 1-2Site 1 internal or external DGND:
Shunt 1–2: Selects internal DGND (AGND)
Shunt 2–3: Selects external DGND
J35Int DGND / Ext DGND:
Site 2		Shunt 1-2Site 2 internal or external DGND:
Shunt 1–2: Selects internal DGND (AGND)
Shunt 2–3: Selects external DGND

J5

-IN Input
Amp A, Site 1

Open

Inverting input, amplifier A, site 1:
Shunt 1–2: Selects external signal through SMA J4
Shunt 2–3: Selects AGND
Open: Bias at Vsupply/2
J10Photodiode BIAS
Amp A, Site 1		OpenPhotodiode bias, amplifier A, site 1:
Shunt 1–2: Selects external bias through SMA J9
Shunt 2–3: Selects AGND
Open: Bias at Vsupply/2

J6

+IN Input
Amp A, Site 1		OpenNon-inverting input, amplifier A, site 1:
Shunt 1–2: Selects external signal through SMA J7
Shunt 2–3: Selects AGND
Open: Bias at Vsupply / 2
J18-IN Input
Amp A, Site 2		OpenInverting input, amplifier A, site 2:
Shunt 1–2: Selects external signal through SMA J17
Shunt 2–3 selects AGND
Open: Bias at Vsupply/2

J21

Photodiode BIAS
Amp A, Site 2		OpenPhotodiode bias, amplifier A, site 2:
Shunt 1–2: Selects external bias through SMA J19
Shunt 2–3: Selects AGND
Open: Bias at Vsupply/2

J23

+IN Input
Amp A, Site 2		OpenNon-inverting input, amplifier A, site 2:
Shunt 1–2: Selects external signal through SMA J22
Shunt 2–3: Selects AGND
Open: Bias at Vsupply / 2
J26-IN Input
Amp B, Site 2		OpenInverting input, amplifier B, site 2:
Shunt 1–2: Selects external signal through SMA J25
Shunt 2–3: Selects AGND
Open: Bias at Vsupply/2
J28Photodiode BIAS
Amp B, Site 2		OpenPhotodiode bias, amplifier B, site 2:
Shunt 1–2: Selects external bias through SMA J27
Shunt 2–3: Selects AGND
Open: Bias at Vsupply / 2
J34+IN Input
Amp B, Site 2		OpenNon-inverting input, amplifier B, site 2:
Shunt 1–2: Selects external signal through SMA J33
Shunt 2–3: Selects AGND
Open: Bias at Vsupply / 2

J12–J15

Input select for switch matrix, Site 1

J12 - Open
J13 - Shunt
J14 - Open
J15 - Shunt

Site 1 SELA0, SELA1, SELB0, SELB1:
Digital input pins for switch and shutdown control:
Open: Low
Shunt: High

J29–J32Input select for switch matrix, Site 2J29 - Open
J30 - Shunt
J31 - Open
J32 - Shunt		Site 1 SELA0, SELA1, SELB0, SELB1:
Digital input pins for switch and shutdown control:
Open: Low
Shunt: High

Table 3-2 details the select pin (SELxx) gain decoder for site 1 connections. For the special case with SELA0 = SELA1 = 1 (device on shutdown mode) decoder table, consult the OPA3S328 data sheet.

Table 3-2 Select Pin Gain Decoder for Site 1

SELA1
J12

SELA0
J13

SELB1
J14

SELB0
J15

Switch Configuration, Gain

Low
(Open)

Low
(Open)

Low

(Open)

Low
(Open)

A1: Closed, A2: Open

B1: Closed, B2: Open, B3:Open

Selects feedback R4 (G = 200 kΩ)

Low
(Open)

High


(Shunt)		Low
(Open)

High


(Shunt)

A1: Open, A2: Closed

B1: Open, B2:Closed, B3:Open

Selects feedback R2 (G = 2 kΩ)

High


(Shunt)

Low
(Open)

High


(Shunt)		Low
(Open)

A1: Open, A2: Open

B1: Open, B2:Open, B3:Closed

Selects default feedback R7 (R7 is Unpopulated)

Table 3-3 details the select pin (SELxx) gain decoder for amplifier A site 2 connections. Table 3-4 shows the select pin (SELxx) gain decoder for amplifier B site 2 connections. For the select pin decoder special case with SELA0 = SELA1 = 1 (shutdown mode), consult the OPA3S328 data sheet.

Table 3-3 Select Pin Gain Decoder for Site2, Amplifier A

SELA1
J29

SELA0
J30

Switch Configuration, Gain

Low
(Open)

Low
(Open)

A1: Closed, A2: Open

Selects feedback R33 (20 kΩ, Switch A1) in parallel with default feedback R37 (200 kΩ)
Gain = 20 kΩ||200 kΩ = approximately 181.8 kΩ

Low
(Open)

High


(Shunt)

A1: Open, A2: Closed

Selects feedback R30 (20 kΩ, Switch A2) in parallel with default feedback R37 (200 kΩ)
Gain = 2 kΩ||200 kΩ = approximately 1.98 kΩ

High


(Shunt)

Low
(Open)

 A1: Open, A2: Open

Selects feedback default feedback R37 (200 kΩ)
Gain = 200 kΩ

Table 3-4 Select Pin Gain Decoder for Site2, Amplifier B

SELB1
J31

SELB0
J32

Switch Configuration, Gain

Low
(Open)

Low
(Open)

B1: Closed, B2: Open, B3: Open

Selects feedback R61
Gain = 200 kΩ

Low
(Open)

High


(Shunt)

B1: Open, B2: Closed, B3: Open

Selects feedback R59
Gain = 20 kΩ

High


(Shunt)

Low
(Open)

B1: Open, B2: Open, B3: Closed

Selects feedback R52
Gain = 2 kΩ

High


(Shunt)

High


(Shunt)

B1: Open, B2: Open, B3: Open

Selects default feedback R49 (unpopulated, feedback Open)