SBOU231 October 2020 OPA3S328

3 Jumper Settings

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

Figure 3-1 OPA3S328EVM Default Jumper Settings

Table 3-1 Default Jumper Configuration

Jumper	Function	Default Position	Description
J11	V- Supply Select	Shunt 2-3	Shunt 2–3: Selects AGND as V- for unipolar supply configuration Shunt 1–2: Selects Ext V- supply for bipolar supply configuration
J16	Int DGND / Ext DGND: Site 1	Shunt 1-2	Site 1 internal or external DGND: Shunt 1–2: Selects internal DGND (AGND) Shunt 2–3: Selects external DGND
J35	Int DGND / Ext DGND: Site 2	Shunt 1-2	Site 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
J10	Photodiode BIAS Amp A, Site 1	Open	Photodiode 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	Open	Non-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	Open	Inverting 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	Open	Photodiode 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	Open	Non-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	Open	Inverting input, amplifier B, site 2: Shunt 1–2: Selects external signal through SMA J25 Shunt 2–3: Selects AGND Open: Bias at Vsupply/2
J28	Photodiode BIAS Amp B, Site 2	Open	Photodiode 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	Open	Non-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–J32	Input select for switch matrix, Site 2	J29 - 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)

SELA1
J12

SELA0
J13

SELB1
J14

SELB0
J15

Switch Configuration, Gain

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

SELA1
J29

SELA0
J30

Switch Configuration, Gain

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)