RF6609A

The RF6609A is a kind of CMOS, seven-pole, six-zero, elliptic low-pass switched-capacitor filter. It has excellent output-band rejection, low passband ripple, and is latchup-free. It is pin- and function-compatible with the Reticon RF5609A and features greatly reduced power consumption, noise, clock feedthrough and output DC offset. The operation of the device is straightforward, only power supplies and an external clock are needed.

There are some features of RF6609A as follows: (1)low power; (2)easy to use-no external components required; (3)8-pin DIP; (4)power supply range: ±5 V±10%; (5)dynamic range: 78 dB minimum; (6)cutoff frequencies from 10 Hz to 25 kHz typical; (7)output noise of 0.35 mVrms maximum; (8)low distortion. The typical applications include: (1)antialiasing filters; (2)portable instrumentation; (3)biomedical/geophysical instruments; (4)speech processing; (5)audio analysis; (6)telecommunications; (7)data communications; (8)reconstruction; (9)tracking filters.

The following is about the absolute maximum ratings of RF6609A: (1)input voltage, any terminal with respect to substrate, pin 6 (VSS): VSS-0.4 to VDD+0.4 V; (2)output short-circuit duration, any terminal: indefinite; (3)operating temperature: 0 to 70; (4)storage temperature: -55 to 125; (5)lead temperature (soldering, 10 sec): 300.

Then is about the device characteristics and operating range limits of RF6609A: (1)±V, supply voltage when +V=VDD, -V=VSS: ±4.5 V min, ±5 V typ and ±5.5 V max; (2)IDD, supply currents when positive supply (VDD): 6 mA typ and 9 mA max; (3)ISS, supply currer when negative supply (VSS): -6 mA typ and -9 mA max; (4)fc, clock frequency: 1 kHz min and 2500 kHz max; (5)CIH, clock high level when refrenced to pin 7: 3 V min and VDD V max; (6)VIL, clocj low level when refrenced to pin 7: VSS V min nad 0.8 V max; (7)Ri, input resistance: 10 M min; (8)Ci, input capacitanceL 15 pF when bonding pad capacitance; (9)RL, load impedance: 10 k min; (10)CL, load impedance: 50 pF max; (11)RO, dynamic output impedance: 10 typ and 250 max.