Dual ADC Model 7072, ADC / SVA

FEATURES

• Two individually selectable modes of operation for each input channel:
  • ADC mode with 500 ns Fixed Conversion Time
  • ADC/SVA (Analog Sampled Voltage Analysis) mode
• Full 8k Conversion Gain and Range
• Dual 10-LED Indicator bar for Instantaneous Dead-Time display, level setting
• Lower Level and Upper Level Discriminator on each ADC input
• Two modes of operation independently selectable for each input channel: Pulse Height Analysis with automatic peak detection and Analog Input Sampling selectable by frontpanel switch
• Single-Channel Analyzer Output
• Designed for easy interfacing to our MCA-3, MCA-3B, SPA-3, MPA-3, MCD-2, MCD-2E, MCD4LAP multichannel analyzers, MCA's from other manufacturers (special cable and external ADC interface required) and Computers

DESCRIPTION

The Model 7072 is a unique dual channel device that can operate either as an ultra fast analog-to-digital converter with a fixed conversion time of 500 ns*, or an analog SVA. Each channel has its own ADC and will operate independently of the other ADC channel. The design is optimized for a short conversion time, excellent stability and high data throughput.

The 7072 is ideally suited for applications requiring very high counting rates.

The built-in Single Channel Analyzer has a separate output on the front panel. This output can be used in the ADC (pulse-height-analysis) mode.

The built-in Single Channel Analyzer has a separate output on the front panel. This output can be used in the ADC and SVA mode.

In the SVA mode a voltage level or waveform can be sampled when a gate signal is applied.

*) Conversion time of ADC. For dead time calculation add time-to-peak and 100 ns transfer time to data buffer.

INPUTS (front panel)

Signal Inputs: BNC-Connector accepts +25mV to +10V (standard / +8V optional) linear pulses, Z_in = 1k Ohm, risetime: ≥ 100ns to 100µs, fall time: 200ns to 100µs (optimized for gaussian shaped pulseswith shaping times from 250 ns to 25µs, dc coupled or a varying voltage level when used in SVA mode.

Gate/Start inputs: BNC-Connector accepts positive TTL for the Gate mode

OUTPUTS (front panel)

SCA: TTL output in PHA and SVA mode (TTL pulse of approx. 0.5µs duration. One output pulse for each input signal that falls between the ULD and LLD setting).

Outputs monitor levels in adjustment mode

OUTPUTS (rear panel)

Data: 13 bit binary data lines and data transfer commands, 25-pin female D-Sub-connector.

General

Temperature range: 0^oC to +50^oC storing

Power Requirements

+24V, 100mA, -24V, 90 mA, +12V, 150mA, -12V, 200 mA, + 6V, 700mA, -6V, 430 mA

Physical

Size: single width NIM module (1.35 x 8.71 inches;

3.43 x 22.13 cm) as per TID - 20893

Shipping weight: 1.8 kg (net 1.0 kg)

Front Panel Control push-buttons

Conversion Range: Push button switch selects quantization of 256, 512, 1k, 2k, 4k, or 8k channels for full scale input.

Coincidence/Anticoincidence: Push button switch selects COINCIDENCE/ANTICOINCIDENCE mode

LLD: adjustment by up/down pushbutton sets the lower level discriminator. The voltage is displayed on the DEADTIME/LEVEL LED indicator and output on the monitor connector for precise adjustment

ULD: adjustment by up/down pushbutton sets the upper level discriminator. The voltage is displayed on the DEADTIME/LEVEL LED indicator and output on the monitor connector for precise adjustment

Front Panel Mode Control Switches

PHA: Pulse Height Analysis mode.

SVA: Analog Sampled Voltage Analysis

Indicators

DEADTIME/LEVEL: Dual 10 LED-bar indicates activity of the ADC. Range 0 to 100% deadtime or actual voltage level indication of ULD and LLD setting

RANGE/MODE: ADC range 256 to 8k in binary steps

ADC Performance

Conv. Range

4k

8k

Resolution: 500 ns flattop pulses

<3.4 chan FWHM

Integral Nonlinearity linear fit

+/-0,16% typical

+/-0,16% typical

Differential Nonlinearity incl. Effects of int.NL

+/-0,7%

+/-1,1%

Differential Nonlinearity for 99% of useable channels

+/-0,5%

+/-0,7%

Counting Rate Capability

> 1.000.000 events/s

Peak shift up to 700 kcounts/s SVA mode

+/-0,006%

Peak shift up to 1.000 kcounts/s SVA mode

+/-0,08%

Unused channels

approx. Top 1% of range