WBK12A & WBK13A

8-Channel Programmable Low-Pass Filter Cards
Features• Eight channels of programmable lowpass anti-aliasing filtering  
• Software-programmable 8-pole ­filters,
configurable as elliptic or ­linear phase• Programmable-cutoff frequencies
from 400 Hz to 100 kHz• Two cutoff frequencies per card, configurable in two 4-channel banks• Full-scale programmable input ranges- Unipolar:  +100 mV to +10V
- Bipolar:  ±50 mV to ±10V
• WBK13A provides eight input channels with simultaneous sampling• WBK13A samples all system channels
within 100 ns of one another

The WBK12A andWBK13A provide
eight channels ofprogrammable low-passfiltering for the WaveBook
data acquisition system

WBK12A and WBK13A are 8-channel
programmable low-pass filter cards for use
with WaveBook data acquisition systems.
These cards, which install* directly into
any WaveBook system or WBK10A expansion module, provide programmablelow-pass filtering over all channels. TheWBK13A further ­enables the simultaneous
sampling of all channels**. If simultaneous
sample and hold is installed in multiple
modules, then all channels are sampled
within 100 ns of one another.

WBK12A & WBK13A Block Diagram
20 MHzclockLow-Pass Filters. Each card provides eight
input channels, arranged in two 4-­channelbanks; a different filter and cutoff frequency can be applied to each bank. The
cards’ filters can be software configured aseither an 8-pole elliptic filter with cutoff
frequencies of 400 Hz to 100 kHz, or an
8-pole linear phase filter with 400 Hz to50 kHz cutoff frequencies.

Divide-by-M
FPGA

Serialconfigurationinterface

Switchedcapfilter

S/H†Channel 1(typ of 8)

DiffPGAAnti-aliasfilter

Serial in
Serial out

DAC Offset
Channel 2
Channel 3
Inputs

Outputmux

Channel 4

BufferampTo
WaveBook A/DChannel 5
Channel 6
Channel 7
Channel 8† for WBK13A only

* Must be factory installed and calibrated** When using a WaveBook system with a WBK11/HR, WBK13A, WBK16/SSH, or WBK18 the perchannel sample rate is 1 MHz where n=number of active channels(n + 1)

Measurement Computing(508) 946-5100

1

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WBK12A & WBK13A

Specifications & Ordering Information
Cutoff Frequencies. The cards provide 5 to
512 cutoff frequencies within each octave(see chart below); these frequencies can be
assigned to each bank. You can individually configure any channel to bypass theprogrammable filter entirely, resulting ina 1-pole low-pass filter at approximately
500 kHz.

Ranges with Installation of WBK12A & WBK13A
Range

WaveBook

WBK10A

Bipolar±10V, ±5V, ±2V, ±1V±0.5V, ±0.2V, ±0.1V±10V, ±5V, ±2V, ±1V±0.5V, ±0.2V, ±0.1V, ±0.05V

Unipolar

Not Available

0 to +10V, 0 to +5V,
0 to +2V, 0 to +1V,
0 to +0.5V, 0 to +0.2V,
0 to +0.1V

Software Selectable Cutoff Frequencies
OctaveNumber ofCutoff Frequencies

400 to 780 Hz
780 to 1570 Hz
1.57 to 3.15 kHz
3.15 to 6.3 kHz
6.3 to 12.5 kHz
12.5 to 25 kHz
25 to 50 kHz
50 to 100 kHz

512
256
128
64
32
16
85

Simultaneous Sample and Hold. The
WBK13A additionally provides per-­channel simultaneous sample and hold.
­Simultaneous sampling of all channels
occurs at the start of a scan sequence. The
system then measures the output of eachsample and hold amplifier at 1 µs/channel
until all channels are measured.
Programmable Gain Amplifiers. Withthe WBK12A or WBK13A installed, gain
ranges of the main product are adjusted­automatically.

Measurement Computing

Specifications

Connector: Internal to the WaveBook(36-pin sockets mate with 36-pin connectors)
Channels: 8
Input Voltage Ranges: Software programmable prior
to a scan sequence, see table above
Programmable Gain Amplifier
Gain Ranges:  x1, 2, 5, 10, 20, 50, & 100
Low-Pass Filter: Software selectable, 8-pole filter
Low-Pass Filter Type:
Software selectable, elliptic or linear phase
Low-Pass Filter Frequency
Cutoff Range: 100 kHz, 75 kHz, 60 kHz…400 Hz,bypass
defined as fc = 300 kHz/N where N = 3 to 750
Filter Grouping:
4 channels each in two programmable banks
Accuracy (typ):With /516A: ±0.012% of reading; ±0.015% ofrange
With /512A: ±0.03% of reading; ±0.015% ofrange
CMRR: -80 dB typ
Aperture Uncertainty: 75 ps max
Voltage Droop: 0.01 mV/ms typ
THD: -65 dB (-70 dB typ)
DC Offset: ±2.5 mV (2 LSB) max at any cutoff
frequency
Weight: 0.14 kg (0.3 lbs)
Power: Derived from WaveBook or WBK10AWBK12: 0.45A @ 15V
WBK13: 0.50A @ 15V(508) 946-5100

2

Ordering Information

Description
Programmable low-pass filter cardfor the WaveBook or WBK10A
Programmable low-pass filter
card with simultaneous sample
and hold amplifiers for theWaveBook or WBK10A

Part No.

WBK12AWBK13A

Product Compatibility✔ WaveBook✔ WBK10A

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