Micromechatronics, Inc. (MMech)

www.mmech.com - Ph: 814-861-5688

PD32 - 32 Channel Piezo Driver

Piezoelectric Drivers

PD32E Med2

pdf-icon_sm PD32 Users Manual

keypad_sm Calculate Power Bandwidth (Grounded Load)

keypad_sm Calculate Power Bandwidth (Floating Load)



Electrical Specifications
  Grounded Load
Floating Load
Output Voltage +45 V to +130 V +/-90 V to +/-130 V
 Peak Current 150 mA per channel 75 mA per channel
 RMS Current 106 mA per channel 53 mA per channel
 Power Bandwidth 50 kHz (120Vp-p) 50 kHz (240 Vp-p)
 Signal Bandwidth 120 kHz 120 kHz
 Slew Rate 19 V/us 38 V/us
 Gain 15 V/V 20 V/V
 Input Impedance 53 kOhm 6.25 kOhm
  Input Offset +/- 5mV +/- 5 mV
 Load Unlimited Unlimited
 Output Noise 200 uV RMS (1uF) 300 uV RMS (1uF)
 Protection Short circuit and thermal
 Imputs 32 Analog inputs, shutdown command
 Outputs 32 HV Analog outputs, overload monitor
 Connectors Industry standard DB-37 (input) and DD-78 (output)
 Power 85 Vrms to 305 Vrms, 50 or 60 Hz, IEC C14 connector
Mechanical Specifications
 Environment 0 - 40 C (32-104 F), Non-condensing humidity
 Dimensions 212 x 304.8 x 88 mm (8.35 x 12 x 3.46 in)
 Weight 2 kg (4.4 lb)


The PD32 is a high-bandwidth, low-noise amplifier for driving up to 32 piezoelectric actuators. The voltage range is configurable from +45V to +/-130V and includes asymmetric voltage ranges such as 0V to +130V. The PD32 works seamlessly with common multi-channel DAC cards and is easy to use with LabView and Simulink. The compact size and 19-inch rack compatibility provides a comprehensive off-the-shelf solution for driving tens, hundreds, or thousands of piezoelectric actuators.

The PD32 is designed for demanding applications such as Adaptive Optics, Acoustic Beam Forming, Materials Testing, Astronomy, Ultrasonics, and Vibration Control. With an output current of 150mA per channel, a large array of piezoelectric actuators can be driven simultaneously at high frequencies. Positive and negative high-voltage bias outputs are also included for compatibility with piezoelectric bender actuators.

Each channel is individually protected against short circuit and thermal overload. Status indicators on the front panel provide individual monitoring of all channels. A digital status signal and external shutdown command is also accessible from the input connector to allow remote monitoring and control. The input and output connectors are industry standard 37 Pin D-Sub connectors which are straight-forward to assemble. Adaptors are available for industry standard 32 Channel DAC cards.

Compatible Actuators

Compatible Actuators
Stack Actuators 60V, 100V, 120V, 150V
Plates and Tubes up to +/-130V
Two Wire Benders up to +/-130V
Three Wire Benders up to 130V, or +/-65V

Output Voltage Range

The output voltage range is configurable between +50V and +/-140V and the load can be either grounded or floating. For peak-to-peak voltages less than 140V, the grounded load configuration is recommended since this provides greater current. The floating load configuration is required for the +/-100V and +/-140V ranges. The desired configuration should be specified at the time of ordering.

Grounded Load Configurations

In the grounded load configurations, the actuator connections are illustrated below. The negative output is internally grounded.

Grounded Load Configurations


The desired output voltage range can be selected from the following table.

Min VoltageMax VoltageOrder Code
0 +130 PD32-V0,130
0 +120 PD32-V0,120
0 +95 PD32-V0,95
0 +70 PD32-V0,70
0 +45 PD32-V0,45
-15 +115 PD32-V15,115
-20 +95 PD32-V20,95
-45 +45 PD32-V45/45
-65 +65 PD32-V65,65
Grounded Output Voltage Ranges

Three wire bender actuators can be driven using the following connection diagram. The HV+ and HV- bias voltages are the minimum and maximum voltages listed in the table above and are accessible on the output connector.



Driving Bender Actuators

Floating Load Configurations

The floating load configuration is useful for achieving higher peak-to-peak voltage swings. The connection diagram is illustrated below. Do not connect either of these signals to ground, for example, to the ground terminal of an oscilloscope probe.

PD32 Floating Config Lg

Floating Load Configuration

The desired output voltage range can be selected from the following table.

Min VoltageMax VoltageOrder Code
-130 +130 PD32-V130,130
-95 +95 PD32-V95,95
Floating Load Voltage Ranges

Input Connection Diagram

The front panel input connector is a DB37 Female Connector (Amphenol L77SDC37SA4CH4F). This connector is also recommended for use on customer PCBs connecting to the PD32 via a male-male DB-37 cable (included). The input connection diagram is illustrated below.

SignalsConnector PinNotes
Analog Inputs 1 to 32 1 - 32 +/-10V max
Ground 33, 34  
Not Connected 35  
Digital disable command 36 3.3V or 5V logic
Overload indicator 37 5V logic
Input Connector Signals
Input Connector Pinout

Output Connection Diagram

The front panel output connector is an industry standard DD78 Female Connector (Harting 09565527613). This connector is also recommended for use on customer PCBs connecting to the PD32 via a male-male DD-78 cable (included). The connection diagram is illustrated below.

SignalsConnector PinNotes
Outputs 1 to 16 (positive) Pins 1 - 16  
Ground 17, 20  
HV+ 18, 19 For driving benders
Outputs 1 to 16 (Negative) 21 - 36  
Ground 37  
HV- 38, 39 For driving benders
Outputs 17 to 32 (Positive) 40 - 55  
Ground 56, 59  
HV+ 57, 58 For driving benders
Outputs 17 to 32 (Negative) 60 - 75  
Ground 76  
HV- 77, 78 For driving benders
Output Connector Signals
Output Connector Pinout


Output Current

The peak output current is 150 mA per channel in the grounded load configuration or 75 mA per channel in the floating load configuration. The maximum RMS current is 106 mA in the grounded configuration and 53 mA in the floating load configuration.

The maximum output current from all channels is 3 Amps RMS.

Power Bandwidth

keypad_sm Calculate Power Bandwidth (Grounded Load)

keypad_sm Calculate Power Bandwidth (Floating Load)

The nominal slew-rate of the PD32 is 19 V/us. Therefore, the maximum frequency sine-wave is


That is, the power bandwidth for a 120 Vp-p sine-wave is 50 kHz. In the floating load configuration, the slew-rate is doubled to 38 V/us, therefore, the power bandwidth for a 240 Vp-p sine-wave is 50 kHz.

With a capacitive load, the power bandwidth is limited by the output current. The maximum frequency sine wave is


where Ipk is the peak current limit, VL(p-p) is the peak-to-peak output voltage, and CL is the effective load capacitance. The power bandwidth versus load capacitance is listed below.

LoadPeak to Peak Voltage (Grounded)
Cap 50 100V 130V
10 nF 95 kHz 47 kHz 34 kHz
30 nF 31 kHz 15 kHz 11 kHz
100 nF 9.5 kHz 4.7 kHz 3.4 kHz
300 nF 3.1 kHz 1.5 kHz 1.1 kHz
1 uF 950 Hz 470 Hz 340 Hz
3 uF 310 Hz 150 Hz 114 Hz
10 uF 96 Hz 48 Hz 34 Hz
30 uF 32 Hz 16 Hz 11 Hz
Power Bandwidth versus Load Capacitance (Grounded Load)
LoadPeak to Peak Voltage (Floating)
Cap 100 200V 260V
10 nF 23 kHz 11 kHz 8.5 kHz
30 nF 7.9 kHz 3.9 kHz 2.8 kHz
100 nF 2.3 kHz 1.1 kHz 850 Hz
300 nF 790 Hz 390 Hz 284 Hz
1 uF 230 Hz 119 Hz 85 Hz
3 uF 80 Hz 40 Hz 28 Hz
10 uF 24 Hz 12 Hz 9 Hz
30 uF 8 Hz 4 Hz 3 Hz
Power Bandwidth versus Load Capacitance (Floating Load)

In the following figures, the maximum frequency periodic signal is plotted against the peak-to-peak voltage.


Maximum Frequency versus Load Capacitance (Grounded Load)
Maximum Frequency versus Load Capacitance (Floating Load)

Small Signal Bandwidth

The small-signal bandwidth and frequency response is described in the following table and figure.

Load Cap.Bandwidth
No Load 120 kHz
10 nF 90 kHz
30 nF 40 kHz
100 nF 11 kHz
300 nF 3.8 kHz
1 uF 1.0 kHz
3 uF 320 Hz
10 uF 62 Hz
30 uF 24 Hz
Small signal bandwidth versus load capacitance (-3dB)
Small signal frequency response

Overload Protection / Shutdown

Each channel is protected against short-circuit and thermal overload. If the thermal overload on any channel engages, the front panel indicator for that channel will illuminate. In addition, an overload on any channel will cause the overload signal (pin 37) on the input connector to go high (+5V).

The amplifier can also be disabled by applying a logic high (3.3V to 5V) to the disable pin (pin 36).

Enclosure / Rack Mounting

The PD32 has a side air intake and rear exhaust. These vents should not be obstructed. If sufficient air-flow is not available, the amplifier will enter a thermal overload state as discussed above.

A single PD32 amplifier can be mounted in 19-inch rack using the single rack kit which includes a spacer, fasteners, and mounting handles (Order code: SingleRackKit-2U). This can be ordered with the amplifier, or separately and retrofitted to any PD32 amplifier. Simple assembly is required.

Two PD32 amplifiers can be rack mounted in a side-by-side arrangement using the double rack kit which includes alternate side panels, fasteners, and mounting handles (DoubleRackKit-2U). This should be ordered with a set of two amplifiers; however, a retrofitting kit for existing amplifiers is available on request. Some assembly is required.

Input Test Connector and Cable

An adaptor PCB is supplied which connects all input channels to a single BNC connector. A 2.5ft DB37 (Male-Male) input cable is also supplied.

Breakout Board (PD32-Breakout)

A screw-terminal breakout board is included which connects to the amplifier via a Female DD78 connector (TE 5748483-5) and HD78 Male-Male cable (2.5 ft). If required, the board can be mounted onto a base structure using the installed M3 hex spacers.



Output breakout board

Standard Shipping Contents

  • PD32 amplifier
  • Output breakout board (PD32-Breakout)
  • Output cable (2.5ft HD78 Male-Male cable)
  • Input test connector PCB, which connects all inputs to a single BNC connector for testing
  • Input cable (2.5ft DB37 Male-Male cable)
  • IEC Power cable to suit the shipping desitination

Signal Adaptors

The signal adaptors allow a direct connection to common multi-channel DAC cards. Standard adaptors are listed below; however, custom adaptors can also be created.

Manufacturer DAC Card Signal Adaptor Notes
Natlional Inst.

PCIe-6738 and

PD-6738 Req. NI SHC68-68-A2 Cable
National Inst.

PCIe-6739 and

PD-6738 Req. NI SHC68-68-A2 Cable
National Inst.

PCI-6723 and

PD-6723 Req. NI SHC68-68-A2 Cable
Standard Signal Adaptors

The adaptors are contained in a compact enclosure that is mounted inline with the PD32 input cable and DAC card output cable.

New PD6738 lg

Standard Delivery Contents

  • PD32 Amplifier with chosen configuration, e.g. PD32-V0,140
  • Input Test PCB
  • Output screw-terminal breakout board
  • Input cable – DB37 Male-Male, 2.5ft (CS-DSDMDB37MM-002.5)
    Output cable – HD78 Male-Male, 2.5ft (CS-DSDHD78MM0-002.5)
  • IEC C13 Power cable with suitable connector for shipping destination


This device produces hazardous potentials and should be used by suitably qualified personnel. Do not operate the device when there are exposed conductors.


The PDC32 is guaranteed against manufacturer defects for a period of 12 months.

More Information

101 Innovation Blvd. Suite 308
State College, PA 16803, USA
Ph: (814)-861-5688