Datasheet LT6604-2.5 (Analog Devices) - 7

LT6604-2.5
TYPICAL PERFORMANCE CHARACTERISTICS Channel Separation vs Frequency Transient Response Gain = 1 (Note 9)
–10 + –30 VOUT 50mV/DIV –50 DIFFERENTIAL –70 INPUT 200mV/DIV –90 VIN = 2VP-P CHANNEL SEPARATION (dB) VS = 5V –110 500ns/DIV 660425 G17 RL = 800Ω AT EACH OUTPUT GAIN = 1 –130 100k 1M 10M 100M FREQUENCY (Hz) 660425 G18
PIN FUNCTIONS +INA, –INA (Pins 2, 4):
Channel A Input Pins. Signals can
+INB, –INB (Pins 10, 12):
Channel B Input Pins. Signals be applied to either or both input pins through identical can be applied to either or both input pins through identi- external resistors, RIN. The DC gain from the differential cal external resistors, RIN. The DC gain from differential inputs to the differential outputs is 1580Ω/RIN. inputs to the differential outputs is 1580Ω/RIN.
VOCMA (Pin 6):
DC Common Mode Reference Voltage
VOCMB (Pin 14):
DC Common Mode Reference Voltage for the 2nd Filter Stage in channel A. Its value programs for the 2nd Filter Stage in Channel B. Its value programs the common mode voltage of the differential output of the common mode voltage of the differential output of the fi lter. Pin 6 is a high impedance input, which can be the fi lter. Pin 14 is a high impedance input, which can be driven from an external voltage reference, or Pin 6 can be driven from an external voltage reference, or Pin 14 can be tied to Pin 34 on the PC board. Pin 6 should be bypassed tied to Pin 8 on the PC board. Pin 14 should be bypassed with a 0.01μF ceramic capacitor unless it is connected to with a 0.01μF ceramic capacitor unless it is connected to a ground plane. a ground plane.
V– (Pins 7, 24, 31, 32, 35):
Negative Power Supply Pin
V+A, V+B (Pins 25, 17):
Positive Power Supply Pins (can be ground). for Channels A and B. For a single 3.3V or 5V supply (V– grounded) a quality 0.1μF ceramic bypass capacitor
VMIDB (Pin 8):
The VMIDB pin is internally biased at mid- is required from each positive supply pin (V+A, V+B) to supply, see Block Diagram. For single supply operation the negative supply pin (V–). The bypass should be as the VMIDB pin should be bypassed with a quality 0.01μF close as possible to the IC. For dual supply applications, ceramic capacitor to V–. For dual supply operation, Pin 8 bypass the negative supply pins to ground and each of the can be bypassed or connected to a high quality DC ground. positive supply pins (V+A, V+B) to ground with a quality A ground plane should be used. A poor ground will increase 0.1μF ceramic capacitor. noise and distortion. Pin 8 sets the output common mode voltage of the 1st stage of the fi lter in channel B. It has a
+OUTB, –OUTB (Pins 19, 21):
Output Pins. Pins 19 and 5.5kΩ impedance, and it can be overridden with an external 21 are the fi lter differential outputs for channel B. With a low impedance voltage source. typical short-circuit current limit greater than ±40mA, each pin can drive a 100Ω and/or 50pF load to AC ground. 660425fa 7