MODEL: 20VS1B
Hybrid IC Isolation Amplifiers 20 Series
ISOLATION AMPLIFIER(input isolation)
Functions & Features• Being used for printed wiring board installation• Up to 2.3 kV isolation between input to output or power
input• Small stray capacitance between input and output• Small installation area in printed wiring board• Gain adjustable range, × 1 to × 10
• Power 11.5 - 16 V DC
Typical Applications• Isolating the field and iput circuit of microprocessor toreduce noise from field• Available for manufacturers of small-lot products to omit
the development of isolation circuit
16 (.63)

20 (.79)

Input offset voltage: ±30 mV
Input bias current: 0.5 nA TYP. (@25°C)

OUTPUT SPECIFICATIONS■ DC Voltage: -7.5 – +7.5 V DC
Load resistance: ≥ 5 kΩ
Output impedance: ≤ 1 Ω

REFERENCE VOLTAGE SOURCE
Output voltage:±15 V DC TYP. (+15 V power supply)±11 V DC TYP. (+11.5 V power supply)
Load current: ≤ 2 mA

INSTALLATIONPower input•DC:
Operational voltage range 11.5 – 16 V;
ripple 2 %p-p max.; approx. 7 mA with no load
Operating temperature: -10 to +70°C (14 to 158°F)
Operating humidity: 30 to 90 %RH (non-condensing)
Mounting: Soldering to the printed wiring board
Weight: 10 g (0.35 oz)

52 (2.05)
mm (inch)

PERFORMANCE in percentage of span

MODEL: 20VS1B–7W7W–U
ORDERING INFORMATION• Code number: 20VS1B-7W7W-U

INPUT / OUTPUT
7W7W: -7.5 - +7.5 V DC (Input resistance 1 MΩ min.)/ -7.5 - +7.5 V DC (Load resistance 5 kΩ min.)

POWER INPUTDC Power
U: 15 V DC

Linearity: ±0.05 %Temp. coefficient:
Offset drift 50 ppm/°C @G = 1
Span drift 50 ppm/°C @G = 1
Frequency characteristics: 1 kHz, 3 dB
Response time: ≤ 450 microsec.
Conversion gain: ×0.95 ±5 %Gain adjustable range: × 1 to × 10
Line voltage effect: ±0.2 % over voltage range
Insulation resistance: ≥ 100 MΩ with 500 V DC
Dielectric strength: 2300 V AC @1 minute (input orreference voltage source to output or power)
CMRR: ≥ 100 dB (500 V AC 50/60 Hz)

GENERAL SPECIFICATIONS
Construction: Hybrid IC
Isolation: Input to output or power

INPUT SPECIFICATIONS■ DC Voltage
Input : -7.5 – +7.5 V DC
Input resistance: ≥ 1 MΩ (10 kΩ in power failure)
Overload input voltage: ±30 V DC continuous
20VS1B SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4424 Rev.1 Page 1/4

MODEL: 20VS1B
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm [inch]

MAX21 (.83)

MAX52 (2.05)

1MAX1614173(.12)

6

PIN ASSIGNMENT

2.54 (.1)

0.7 (.03) dia.
12.7 (.5)

20.32 (.8)

1(.04)

7.62(.3)

20.32 (.8)

1

FEEDBACK2INVERTING INPUT

3NON-INVERTING INPUT

4COM (–)

5REFERENCE VOLTAGE SOURCE (+)

6REFERENCE VOLTAGE SOURCE (–)

14

POWER SUPPLY (+)

15POWER SUPPLY (–)

16OUTPUT (–)

17OUTPUT (+)

SCHEMATIC CIRCUITRY & CONNECTION DIAGRAMFEEDBACK 1
INVERTING INPUT 2
NON-INVERTING INPUT 3

INPUTIsolation
OutputDriverAmplifier

17 +OUTPUT

416 –(+) 514 +(–) 615 –COM (–)

POWER SUPPLYREFERENCE VOLTAGE SOURCENote. The reference voltage source is common to the COM (–), terminal 4.

APPLICATION EXAMPLEThe series resistance of the amplifier, R1 + R2 must be between 10 kΩ and 200 kΩ.
n Non-inverting amplifier circuit: Basic example of G = 0.95
1R1+–2–3+17 ++OUTPUT ±4.75V DC

INPUT ±5V DC–REFERENCE
VOLTAGE SOURCE

416 –+ 514 +– 615 –POWER 15V DC

Non-inverting circuit G = 0.95

20VS1B SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4424 Rev.1 Page 2/4

MODEL: 20VS1B■ Inverting amplifier circuit: Basic example of G = -0.95 (output inverted to the input)
R1R11+–2–3+INPUT ±5V DC

17 ++OUTPUT ±4.75V DC

416 –+ 514 +– 615 ––POWER 15V DC

REFERENCE VOLTAGE SOURCE

Inverting circuit G = -0.95■ Non-inverting amplifier circuit: Example of G = 1 + R1 / R2
R2R11–17 +2–+3+–416 –+ 514 +– 615 –+OUTPUT VO

INPUT VIN

POWER 15V DC

REFERENCE VOLTAGE SOURCE

Non-inverting amplifier circuit G = 1 + R1 / R2

■ Inverting amplifier circuit: Example of G = -R1 / R2 (output inverted to the input)
R2R11+–2–3+INPUT VIN+17 +OUTPUT VO

416 –+ 514 +– 615 ––

POWER 15V DC

REFERENCE VOLTAGE SOURCE

Inverting amplifier circuit G = -R1 / R2

■ Non-inverting amplifier's circuit with external adjustments: Example of G = 210kΩ
(SPAN)
10kΩ

9kΩ

12kΩ

+INPUT ±2.5V DC
200Ω

–
30kΩ

50kΩ
(ZERO)–2–

3++17 +OUTPUT ±5V DC

416 –

5 + REFERENCE

14 +VOLTAGE
6 – SOURCE

15 –POWER 15V DC

Non-inverting amplifier circuit zero/span adjustments (input ±2.5V, output ±5V)

20VS1B SPECIFICATIONS

MG CO., LTD.
www.mgco.jpES-4424 Rev.1 Page 3/4

MODEL: 20VS1B■ Inverting amplifier's circuit with external adjustments: Example of G = -1 (output inverted to the input)
10kΩ
(SPAN)
10kΩ

9kΩ

1+2kΩ

–

3+INPUT ±5V DC–100kΩ
(ZERO)

200Ω
30kΩ

–

2+

17 +
OUTPUT ±5V DC

416 –

5 + REFERENCE

14 +VOLTAGE
6 – SOURCE

15 –POWER 15V DCInverting amplifier circuit zero/span adjustments (input ±5V, output ±5V)

■ Non-inverting amplifier circuit: Example of ±10V DC output (±10V DC to the input ±5V DC)+15V

1–R1+–2–3++R3-15V

INPUT ±5V DC

416+ 514–++17OUTPUT ±10V DC
R3–+REFERENCE VOLTAGE SOURCE

15– 6POWER 15V DC–Non-inverting circuit G = 1 + R3 / R3 =2■ Inverting amplifier circuit: Example of ±10V DC output (output inverted to the input)+15V
R1R1+12–3+

INPUT ±5V DC–––+

17R3-15V

164++OUTPUT ±10V DC
R3–+ 5
14 +REFERENCE VOLTAGE SOURCE– 6POWER 15V DC

15 –Inverting circuit G = -(1 + R3 / R3) = -2

Specifications are subject to change without notice.

20VS1B SPECIFICATIONS

MG CO., LTD.
www.mgco.jp

ES-4424 Rev.1 Page 4/4