DBK45

4-Channel SSH Card with Low-Pass FilterFeatures• Provides four differential inputs withsimultaneous sampling*• Configurable gain ranges of x1, 10, 100,200, and 500• Provides four independent 3-pole low
pass filter channels• User-configurable low-pass filter fromDC to 50 kHz cutoff• Convenient BNC input connectors• Channels are sampled within 100 nsof each other
Each DBK45 card provides four differential analog input channels equipped with
low-pass filters and simultaneous sampleand hold.
The DBK45 provides a wide selection offull scale inputs. Each channel features its
own instrumentation amplifier with gain
ranges of x1, 10, 100, 200, and 500, as wellas individually configurable low-pass filters.
This lets you maximize your signal via theDBK45’s input ranges, low-pass filter theoutput, and simultaneously sample andhold* all channels before ­digitizing. Upto 64 DBK45 cards can be attached to one
system for a total of 256 ­differential inputs.

The DBK45 provides four channels of simultaneous sample and hold, as well as low-pass filtering

DBK45 Simultaneous Sample & Hold Card Block Diagram
P1
ENB

Module address
recognition circuit

Input Ch 1
Input Ch 2

Mux
Output channel
selection header

Input Ch 3
Input Ch 4

Gain Ranges. In addition to featuring
jumper-pin selectable x1, 10, 100, 200,
and 500 gain, each of the DBK45’s fourchannels is equipped with a location fora user-selected gain resistor, allowing you
to select a custom gain up to x500. (Thisgain range is selectable via a gain-selectswitch per channel.)

A3

Channel address lines

3

Gain set switch
SS&H
enable/bypass
headerBypassSignal out
Enable10K
Bypass200pFLow-Pass Filters. Each DBK45 channel isequipped with a low-pass filter that is user
configured for cut-off frequencies from DC
to 50 kHz, and for Butterworth, Chebyshev,or Bessel characteristics. The DBK45’s
frequency determining resistor and capacitor locations are on ­machined-pin IC
sockets for maximum flexibility. The cardis provided with blank plug-in headers

IALow-pass EnablefilterFilterenable/bypass
header10K

SS&H

Control

200pF

Note: Typical of all channels

for each channel, to which you can add
passive components for particular frequencies. Preconfigured plug-in headers forseveral preselected cutoff ­frequencies are­optionally available.

Connections. The DBK45 is equipped witha DB37 connector for the data acquisition
system and BNC connectors with switchable bias resistors for accepting analog
signal inputs.

* In systems incorporating DBK products with SSH, the per-channel rate is [maximum sample rate/(n + 1)],
where n=number of channels

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DBK45Specifications & Ordering Information
Specifications

Connector: DB37 male, mates with P1*; BNC connectors for signal inputs
Number of Channels: 4
Number of Cards Addressable: 64
Input Type: Differential
Voltage Input Ranges:
0 to ±5 VDC
0 to ±500 mVDC
0 to ± 50 mVDC
0 to ±25 mVDC
0 to ±10 mVDC
For Custom Gains:

R user =40,000- 80
Gain-1(Ohms)

Input Amplifier Slew Rate: 12 V/µs min
Active Filter Device: UAF42 (Burr-Brown)
Number of Poles/Filter: 3
Types of Filters: Bessel, Butterworth, and Chebyshev
Bandwidth: 72.4 kHz (filter bypass)Frequency Range: 0.1 Hz to 50 kHz; the frequency isset by installation of 4 to 6 resistors and/or capacitors in the provided socket locations
Frequency Modules: Optional frequency module
kits are available that consist of 4 plug-in resistor/
capacitor (RC) headers preconfigured for any of thefollowing frequencies—5 Hz, 10 Hz, 100 Hz, 500 Hz,or 1 kHz; all are Butterworth type filters
Acquisition Time: 0.6 µs (10V excursion to 0.1%);
0.7 µs (10V excursion to 0.01%)
Channel-to-Channel
Aperture Uncertainty: 50 ns
Output Droop Rate: 0.1 µV/µs
Input Gains: x1, 10, 100, 200, 500, and user deter-

mined up to 500
Input Offset Voltage: [500 + 5000/G] µV max (nullable)
Input Offset Drift: [±5 + 100/G] µV/˚C max
Input Bias Current: 100 pA max
Input Offset Current: 50 pA max
Input Impedance: 5 x 1012 Ohms parallel with 6 pF
(without 100K bias resistors enabled)
Switchable Bias Resistors: 100K each to analog
commonGain Errors:x1		
±0.04% max
x10±0.1% max
x100±0.2% maxx200±0.4% max
x500±1.0% max
Gain vs. Temperature:x1		±20 ppm/˚C max
x10±20 ppm/˚C max
x100±40 ppm/˚C max
x200±60 ppm/˚C max
x500±100 ppm/˚C max
Non-Linearity:x1		±0.015% FS max
x10±0.015% FS max
x100±0.025% FS max
x200±0.025% FS max
x500±0.045% FS max
Common-Mode Rejection:x1		
70 dB minx10
87 dB minx100
100 dB min
x200
100 dB min
x500
100 dB min
Dimensions: 209 mm W x 82 mm D x 19 mm H
(8.25” x 0.75” x 3.25”)
Power Consumption:  1565 mW

Ordering Information
Description
4-channel simultaneous
sample and hold card with four
blank headers for user configured
cut-off frequencies

Part No.

DBK45

Accessories
Additional set of four blank headers

FM/USER

Pre-configured Frequency Modules (Butterworth)
100 HzFM100
500 Hz
FM500
1 kHz
FM1000Cables
For use with DBK10, use CA-37-x ribbon cable, orcontact factory of additional cabling options
For use with DBK60 or LogBook/360, no cable isrequired (except from DBK60 or LogBook/360 tothe A/D mainframe)
For use with no enclosure, use CA-37-x where x is thenumber of DBK devices attached
For use with DaqLab Series (internal slots), use
CA-255-2T with one board, or CA-37-2 for use with
two DBK cards (or contact factory for additionalcabling options)

Product Compatibility✔ LogBook✔ DaqBook✔ DaqLab✔ DaqScan✔ DaqBoard/2000 Series* Attachment to the DaqBoard/2000 Series requires a DBK200, DBK202, DBK203A, DBK209, DBK213, orDBK214

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