Agilent Technologies DC122 User Manual download pdf (Page 13)

User Manual: Agilent Acqiris 10-bit Digitizers Page 13 of 27

3.2. Channel Input

The 10-bit digitizer family can be configured with a variety of front-end mezzanine boards offering different

capabilities. The currently available front end options are detailed below:

Front End

Option

Impedance

Bandwidth

Guaranteed

(typical)

/ Risetime

BW Limiter

selections

FS Voltage

Ranges

Maximum

Offset

/ Max. Voltage

Standard

(Std) F50

Ω

2 GHz

0.17 ns

20, 200, 700 MHz 0.05 – 5.0 V

± 5 V

5 V

High-

Impedance

(HZ) FHZ

Ω

950 MHz

( 1 GHz)

0.35 ns

20, 200, 700 MHz 0.05 – 5.0 V

± 5 V

5 V

1 M

Ω

(300 MHz)

1.2 ns

20, 200 MHz

(see remark below)

0.05 – 50 V

20 V (> 0.5 V FS)

± 200 V (> 5V FS)

300 V

High-

Frequency

(HF) FHF

Ω

3 GHz

0.12 ns

1 V

± 1.0 V

2 V

A given unit’s model number will indicate which front end option is installed. If nothing follows the number itself

then the standard front end option is present.

Units can be ordered with BNC or SMA connectors.

For DC2x2HZ units and FS > 5 V, only the 20 MHz Bandwidth Limiter is available.

3.2.1. Standard & High Impedance Coupling

Both AC and DC coupling modes are available. The AC mode couples signals capacitively thus removing the input

signal’s DC component and filtering out any signal component below 16 Hz for the HZ option or 32 Hz for the Std

option. DC mode allows all signal components to be passed through to the digitizer.

3.2.2. Impedance

The input channels of the 10-bit digitizer Family offer termination in either 50 Ω or 1 MΩ. The 50 Ω coupling mode

for the Standard and High-Impedance front ends, offers high quality termination with better than ± 1% precision. It is

ideally suited to use with 50 Ω transmission lines (coax), high bandwidth low impedance (typically 500 Ω) probes or

active probes. The HF 50 Ω coupling mode has ± 2% precision The 1 MΩ coupling mode provides a high impedance

(low load) capability that is suited for use with most standard high impedance probes. The high impedance mode also

features low (14 pF typical) capacitance that helps to minimize loading effects that can occur when probing high

frequency circuits.

3.2.3. Input Protection

The input amplifiers are protected against over-voltage signals as shown in the table. The High-impedance limit

refers to the input signal’s DC + peak AC < 10 KHz voltage.

3.2.4. Mezzanine Front-end

The front-end electronics are all mounted on a removable mezzanine card. In the event of accidental damage or as

components fatigue over time (e.g. relays in high duty cycle automated testing applications), the mezzanine card

allows for fast and efficient replacement.

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Agilent Technologies DC122 User Manual Page 13

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