High Precision V/F Conversion Circuit
Introduction
ER-VFC-G30M is a high-precision voltage/frequency conversion circuit with charge integration, which can simultaneously convert the current signals output by three accelerometers continuously. The product has the characteristics of small volume, low power consumption and high precision.
Specification
Power supply: VCC=+15V±3%, VEE=-15V±3%, VDD=+5V±3%
| Spec. | Test condition | Min | Typical | Max | Unit |
| Measuring range FS | whole temperature range | ±30 | - | - | mA |
| Scale factor SF | whole temperature range | - | 3500 | - | pulses/s/mA |
| Maximum output frequency | whole temperature range | - | - | 128 | kHz |
| Zero position F0 | room temperature | 0 | - | 100 | nA |
| Temperature coefficient (absolute value) | whole temperature range | - | - | 20 | ppm/℃ |
| Scale factor asymmetry | I=±1mA, TC =25℃ | - | - | 2 | pulse/s/mA |
| Scale factor asymmetry | whole temperature range 1mA≤|I|≤FS | - | 50 | 100 | ppm |
| Single power stability (1σ) | I=±1mA, TC =25℃ | - | 30 | 50 | ppm |
| Operating temperature range TC | - | -45 | - | 70 | ℃ |
| Size | 76*50*9.0 | mm | - | - | - |
| Interface form | double line pin extraction | - | - | - | - |
Power supply requirements
| Item | Recommended range | Steady-state current | Internal capacitance value 2 |
| +15V Power supply | +15V±3% | ≤0.02A | ≤50uF |
| -15V Power supply | -15V±3% | ≤0.02A | ≤50uF |
| +5V Power supply | +5V±3% | ≤0.03A | ≤50uF |
Connector pin definition
| No. | Name | Type | Details | To |
| 1 | DGND | digital ground | digital ground | Pulse acquisition board |
| 2 | TB | input | clock input | Pulse acquisition board |
| 3 | F3B | output | Z channel negative pulse output | Pulse acquisition board |
| 4 | F3A | output | Z channel negative pulse output | Pulse acquisition board |
| 5 | F2B | output | Y channel negative pulse output | Pulse acquisition board |
| 6 | F2A | output | Y channel negative pulse output | Pulse acquisition board |
| 7 | F1B | output | X channel negative pulse output | Pulse acquisition board |
| 8 | F1A | output | X channel negative pulse output | Pulse acquisition board |
| 9 | GND | Power ground | power ground | DC/DC power panel |
| 10 | +5V | Power supply | +5V power supply | DC/DC power panel |
| 11 | -15V | Power supply | -15V power supply | DC/DC power panel |
| 12 | +15V | Power supply | +15V power supply | DC/DC power panel |
| 13 | SGND | signal ground | X channel accelerometer input low end | accelerometer |
| 15 | SGND | input | Y channel accelerometer input low end | accelerometer |
| 16 | IY | input | Y way accelerometer input high end | accelerometer |
| 17 | SGND | Power ground | Z-channel accelerometer input low end | accelerometer |
| 18 | IZ | Power ground | Z-channel accelerometer input high end | accelerometer |
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