6604B & 6624
Quad Filter/Amplifier – 80 dB/Octave – 25.575 kHz
DESCRIPTION
SALIENT FEATURES
The Series 6604B and 6624 quad filter/amplifiers provide a
choice of four filter characteristics (HP1, LP1, TD6 & HLP), two
wide frequency ranges (A: 1 Hz to 25.575 kHz and B: 0.1 Hz
to 10.23 kHz), four reduced-cost, limited frequency ranges
(K, L, M and N) and numerous options to meet your specific requirements. Your choice of gain: the 6604B provides programmable
decibel gain and the 6624 offers programmable binary gain.
Cutoff Frequencies: 0.1 Hz to 25.575 kHz
Filter Types: HP1, LP1 (80 dB/octave)
TD6 (linear phase), HLP (59.5 dB/octave)
6604B Gain: Pre-filter gain: 0 dB to 40 dB
Post-filter gain: −9.9 dB to 20 dB
6624 Gain: Pre-filter gain: 1 to 128
Post-filter gain: 0.001 to 10.2375
Input: Hi-Z single-ended, Hi-Z differential
Low-drift differential, Zero suppress
Output: Single-ended, Differential, Ground reference
System: Calibration, Monitor, Bypass
Programmable filter bypass, output monitor, and output ground
reference are standard on the 6604B and 6624.
The 6604B and 6624 are intended for use in the 6000 System
where they can provide 64 anti-alias filter/amplifiers or 32
band-pass filter/amplifiers with differential input, pre-filter and
post-filter gain, calibration, and monitoring. All this is available
in a single 7"-high rack-mounted mainframe.
OPTIONS
0.100
0.075
0.050
0.025
1k
10 k
25.575 k
Cutoff Frequency (Hz)
1.00
0.75
0.50
0.25
Phase Match (Degrees)
6604B & 6624 Typical Filter Performance
Amplitude Match (dB)
Option 1 AC cpld, single-ended input (1µF/50V + 10 MΩ)
Option 2 AC cpld, diff input (1µF/50V + 10 MΩ each side)
Option 5 Prog AC/DC coupled, single-ended input
(1µF/50V + 10 MΩ)
Option 6 Prog AC/DC coupled, differential input
(1µF/50V + 10 MΩ each side)
Option 7 Fixed input gain of 10 for single-ended input
Option 8 Fixed input gain of 10 for differential input
Option 9 AC coupled, single-ended input with selectable
2.2 mA, +15V current source for ICP® transducers
Option A Programmable pre-filter gain
6604B: 0 dB, 10 dB, 20 dB, 30 dB and 40 dB
6624: 1, 2, 4, 8, 16, 32, 64 and 128
Option C Calibration input
Option D Hi-Z, differential input
Option G Programmable post-filter gain
6604B: −9.9 dB to 20 dB in steps of 0.1 dB
6624: 0.001 to 10.2375
Option L Low drift, DC-cpld, diff in for low-Z transducers
Option T Differential output
Option Z Zero suppress—requires differential input
FILTER CHARACTERISTICS
See the HP1, LP1, TD6 & HLP sheets for more information.
HP1:
6 pole, 6 zero elliptic (Cauer) high-pass filter
(80 dB/octave)
LP1:
6 pole, 6 zero elliptic (Cauer) low-pass filter
(80 dB/octave)
TD6:
6 pole, 4/6 zero time-delay low-pass filter
–linear phase– select TD6A or TD6B at front panel
TD6A:
6 pole Bessel low-pass w/ 4 stop-band zeros
for minimum overshoot and fast settling
TD6B:
2 additional zeros flatten pass-band of TD6A:
some overshoot – but better amplitude response
HLP:
6 pole, 6 zero unity normalized natural frequencies,
plug programmable for high-pass or low-pass
6604B/6624 Cutoff Frequency Settings
Low Range (Hz)
High Range (Hz)
Model
Number
Min
Max
Step Min Max Step
6604B/24-A
1.0
1023.0
1.0
1025 25,575
25
6604B/24-B
0.1
102.3
0.1
110
10
6604B/24-K
25
25,575
25
6604B/24-L
10
10,230
10
6604B/24-M
1.0
1,023
1.0
6604B/24-N
0.1
102.3
0.1
10,230
Let Fc = Programmed Cutoff Frequency
Let Fin be a signal frequency in the passband (DC to Fc for
LPF or Fc to 40 kHz for HPF) of the filter
Amplitude Accuracy (includes Options A and G, if installed)
LP1, TD6, HLP (LP): ±0.1 dB, DC to Fc
HP1, HLP (HP): ±0.1 dB, Fc to 25.575 kHz;
±0.2 dB, 25.575 kHz < Fin ≤40 kHz
Composite Amplitude and Phase Match
LP1, TD6, HLP (LP): −33 dB, DC to Fc
HP1, HLP (HP): −33 dB, Fc to 25.575 kHz;
−27 dB, 25.575 kHz < Fin ≤40 kHz
FILTER CHARACTERISTICS (Cont)
Cutoff Amplitude: −3.01 dB: HP1, LP1, TD6B;
−9.61 dB: TD6A; −2.40 dB: HLP
Min Frequency: DC for low-pass filters w/o AC cplg
Max Input: 10 Vpk to 100 kHz; |10 Vpk| (100k/f), f>100 k
Max Output (with 10 Vpk at 50 kHz; 7.07 Vpk at 100 kHz;
Filter Bypassed): |7.07|(100 kHz/f) for f>100 kHz
Small Signal BW: 100 kHz
6604B & 6624 INPUT CHARACTERISTICS
Standard:
Z:
Level:
Noise (RTI):
Offset:
Bias Current:
DC coupled, single-ended input
10 MΩ // 100 pF
±10 Vpk linear; ±50 Vpk without damage
5 µV rms typical;
20 µV rms max into 100 kHz BW at max gain
±100 µV ±10 µV/oC, typical
<10 pA, typical
Option 1:
Z:
Level:
AC coupled, single-ended input
(1µF & 10 MΩ) // 100pF
±10 Vpk linear; ±50 Vpk without damage
Option 5:
Programmable AC/DC coupled, single-ended
See standard specs and Option 1 specs
Option D:
Z:
DC coupled, differential input
10 MΩ // 100pF per input;
5 MΩ // 200pF common mode
5 µV rms typical;
20 µV rms max into 100 kHz BW at max gain
±10 Vpk linear; ±50 Vpk without damage
80 dB, DC to 500 Hz; 70 dB, 500 Hz to 100 kHz
±100 µV ±15 µV/oC, typical
<10 pA, typical
Noise (RTI):
Level:
CMRR:
Offset:
Bias Current:
TRANSFER CHARACTERISTICS
Standard:
Bypass:
Distortion:
Crosstalk:
Hum:
Unity gain, 0 dB ±0.1 dB
Bypasses the filter and gain options; the
input and output buffers remain in circuit
−80 dB re fullscale, 2 kΩ load at 1 kHz
−80 dB re fullscale (10 Vpk)
−100 dB re fullscale (10 Vpk)
Option 7:
Fixed input gain 10 ±0.1% for S.E. input
Option 8:
Fixed input gain 10 ±0.1% for diff input
Option A:
Pre-filter gain
6604B: 0 to 40 dB in 10 dB steps
6624: 1, 2, 4, 8, 16, 32, 64 and 128
Option G:
Post-filter gain
6604B: −9.9 to 20 dB, 0.1 dB steps
6624: 0.001 to 4.095 in 0.001 steps and
4.0975 to 10.2375 in 0.0025 steps
OUTPUT CHARACTERISTICS
Standard:
Z:
Max Out:
Offset:
Drift:
Noise:
Option T:
Z:
Max Out:
Offset:
Drift:
Noise:
Option 2:
Z:
Level:
CMRR:
AC coupled, differential input
(1µF & 10 MΩ) // 100pF each side
±10 Vpk linear; ±50 Vpk, w/o damage
80 dB, 40 Hz to 500 Hz;
70 dB, 2 Hz to 40 Hz and 500 Hz to 100 kHz
Option 6:
Prog AC/DC coupling for diff in; see Opts 2 & D
Size:
Option 9:
AC coupled, single-ended in w/ selectable
2.2 mA, +15 V current source for IEPE xducers
Weight:
Option L:
Z:
Low-drift, DC-coupled, differential input
10 MΩ // 100pF per input;
5 MΩ // 200pF common mode
5 µV rms typical;
20 µV rms max into 100 kHz BW at max gain
±10 Vpk linear; ±50 Vpk without damage
80 dB, DC to 500 Hz; 70 dB, 500 Hz to 100 kHz
±100 µV ±5 µV/oC, max
<10 pA, typical
Noise (RTI):
Level:
CMRR:
Offset:
Bias Current:
Option Z:
Level:
Accuracy:
P8288 Rev A
Programmable zero suppress to suppress
input offsets—requires differential input
0 V to ±10.235 V in steps of 5 mV
±1% of setting ±10 mV
DC coupled, single-ended output w/ output
ground reference to break ground loops
50Ω // 100 pF
±10 Vpk, ±2 mA pk
Adjustable to zero
50 µV/oC + (input drift)(gain)
200 µV in 100 kHz BW (at maximum cutoff
and unity gain)
DC coupled, differential output
50Ω // 100 pF each side
+10 Vpk; ± 2 mA pk
Adjustable to zero
100 µV/oC + (input drift)(gain)
300 µV in 100 kHz BW (at maximum cutoff
and unity gain)
GENERAL CHARACTERISTICS
Power:
Temperature:
5.86 x 12.9 x 0.75 inches
(14.43 x 32.77 x 1.91 cm)
1.87 lbs net, 3.3 lbs shipping
(0.85 kg net, 1.5 kg shipping)
±18 V at 170 mA;
+24 V at 135 mA;
+ 5 V at 50 mA
0oC to 40oC (operating);
–20oC to 70oC (storage)