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PSPL5868 10.7 Gb/s Driver Amplifier Datasheet

PSPL5868 Datasheet

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PSPL5868 Datasheet


The Model PSPL5868 driver amplifier is intended for use as a modulator driver or as a linear amplifier. This device includes internal temperature compensation for excellent output stability over temperature, and exhibits both high output and low power dissipation. It also incorporates internal sequencing circuitry, making it insensitive to power supply application sequence.

Key performance specifications
  • 11 V output amplitude 10.7 Gb/s Modulator Driver
  • Linear amplifier with 28 dB gain
  • 30 kHz to 11.8 GHz bandwidth
  • Temperature compensated design for output stability
  • Includes bias network, crossing point control & adjustable output voltage

Typical 10.7 Gb/s eye measurements


Input from Tektronix PPG1601, PRBS = 223–1, 750 mV


Output amplitude, 11 V


Typical performance


Typical small signal S21 (measured at –20 dBm input power)


Typical small signal S11 and 22 (measured at –20 dBm input power)


Typical performance plots


Output voltage vs. Input voltage (Gain control bias = Vgc, TCASE = 35 °C


Crossing point vs. Vcp



The PSPL5868 10.7 Gb/s modulator driver can be operated using only three of the available 7 pins. The DC pins required for operation are 1, 3, and 7. The RF connectors and DC pins are shown in the following drawing and table. Warning: To prevent damage, provide a ground connection at pin 7 before applying voltage to the PSPL5868.

Pin Descriptions
Pin # Pin Lable Description
  IN SMA, signal input, Vamp≤ 1.5 V (damage threshold)
+V Positive DC voltage supply, 8.25 V 12
GC VgcVariable output control, -15 V ≤ Vgc ≤ 0 V 3
-V Negative DC voltage supply, -5.25 V ≤ V ≤ -4.75 V 2
CP Crossing point adjust, -5 V ≤ Vcp ≤ 5 V 4
VB DC Voltage bias, -17 ≤ VB ≤ +33  5
NC No connection / Not used
GND Ground connection
  OUT SMA, signal output

1 At 8.25 V, approximately 3 W is dissipated.

2 No power sequencing is necessary. Voltages may be applied in any order after ground is applied.

3 Output Control: With VGC at 0 V, or left floating (disconnected), the driver will provide maximum gain and maximum output voltage. The user can decrease VGC to decrease the RF signal gain when the driver is operating in the linear regime, or to reduce the output voltage level when the driver is operated in saturation (this will also reduce the power dissipated).

4 The crossing point may vary until unit achieves thermal equilibrium. VCP > 0 V will lower the output crossing point and increase power dissipation. Care must be taken to ensure that the positive supply current does not exceed 400 mA.

5 Voltage Bias: The VB pin allows the user to apply a low current (less than 3.5 mA) DC offset to the Signal Output for biasing electro-optic modulators through a 2.5 kΩ resistor.


Parameter Symbol Units Minimum Typical Maximum Comments
Impedance Z ohms   50     
Upper 3 dB freq. fc,h GHz   11.8    Relative to gain at 2 GHz
Lower 3 dB freq. fc,l kHz   30    Relative to gain at 2 GHz
Small signal gain S21  dB   28.5    Measured at 2 GHz
Max Power Out (-1 dB gain comp) P1 dB dBm   24.4    Measured at 2 GHz
Output Eye Voltage with VGC = 0 V VOUT Vamp 10.5  11    Vin = 0.75 Vamp, 10.7 Gb/s PRBS
Output Eye Voltage with VGC = -15 V VOUT Vamp   1.5  2.5  Vin = 0.75 Vamp, 10.7 Gb/s PRBS
Return Loss, Input and Output S11, S22 dB   -16 
  50 MHz 5 GHz ≤ f
Rise Time tr ps   31    10-90%, Vin = 0.75 Vamp, 10.7 Gb/s PRBS
Fall Time tf ps   36   
Additive Jitter
    Vin = 0.75 Vamp, 10.7 Gb/s PRBS, measured at crossing point
Overshoot   %     10.7 Gb/s PRBS
Undershoot   %     10.7 Gb/s PRBS
Eff. Input RMS Noise Voltage   μV rms   152     
Noise Figure NF dB   5.75    f = 1 GHz
Output Eye Voltage Variation Δ VOUT %   ±5    Vgc = 0 V, Vin = 0.75 Vamp, TCASE = -5 to 75 °C
Crossing Point Adjust   % ±12  -13.5 / +17.5    ±5 V input at Vcp, Vin = 0.5 Vamp
Crossing Point Variation   %   ±5    Vin = 0.75 Vamp, 10.7 Gb/s PRBS, TCASE = -5 to 75 °C
Polarity Non-Inverting
Coupling AC, input and output
RF Connectors SMA jacks (f)
DC Connector Solder pins
Voltage Supply (+) +VDC V 8.25  8.5   
Voltage Supply (-) -VDC V -5.25  -5  -4.75   
Supply Current (+) +IDC mA   325    Vout = 11 Vamp 1
Supply Current (-) -IDC mA   20     
Power Dissipation Pdiss W   3.3  Vout = 11 Vamp 2
Max Allowed Input   Vamp     1.5  Input damage threshold
Output Voltage Bias Vbias VDC -17  33  No connection required 3
Gain Control Bias Vgc VDC -15  No connection required
Crossing Point Bias Vcp VDC -5  No connection required
Operating Temp TCASE °C -5    75  Case temperature
Storage Temp Tstor °C -40    125   
Warranty One year

1 The PSPL5868 can be damaged by excessive heat that is produced when driving low duty cycle positive pulses. To ensure the amplifier will not be damaged by overheating, it is recommended the positive supply voltage has its current limit set to 400 mA.

2 Vgc can be used to lower the output level and power dissipated. Vcp > 0 V will lower the crossing point and increase the power dissipated.

3 A 2.5 kΩ resistor is connected to the output from the Vbias pin for adding a low current (≤ 3.5 mA) DC bias.

Mechanical dimensions

Ordering information