LTC5569 查看數據表（PDF） - Linear Technology

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LTC5569

14-Bit 80Msps Low Power 3V ADC

Linear Technology 

LTC5567

Pin Functions

TEMP (Pin 1): Temperature Sensing Diode. This pin is

connected to the anode of a diode that may be used to

measure the die temperature, by forcing a current and

measuring the voltage.

GND (Pins 2, 4, 9, 12, 13, 16, Exposed Pad Pin 17):

Ground. These pins must be soldered to the RF ground

plane on the circuit board. The exposed pad metal of the

package provides both electrical contact to ground and

good thermal contact to the printed circuit board.

RF (Pin 3): Single-Ended RF Input. This pin is internally

connected to the primary winding of the integrated RF

transformer, which has low DC resistance to ground. A

series DC-blocking capacitor must be used if the RF

source has DC voltage present. The RF input is 50Ω

impedance matched from 1.4GHz to 3GHz, as long as

the mixer is enabled. Operation down to 300MHz or up

to 4GHz is possible with external matching.

EN (Pin 5): Enable Pin. When the input voltage is greater

than 2.5V, the mixer is enabled. When the input voltage is

less than 0.3V, the mixer is disabled. Typical input current is

less than 30µA. This pin has an internal pull-down resistor.

VCC (Pin 6): Power Supply Pin. This pin must be connected

to a regulated 3.3V supply, with a bypass capacitor located

close to the pin. Typical DC current consumption is 34mA.

NC (Pins 7, 14): These pins are not connected internally.

They can be left floating, connected to ground, or to VCC.

IADJ (Pin 8): This pin allows adjustment of the mixer DC

supply current. Typical open-circuit DC voltage is 2.2V.

This pin should be left floating for optimum performance.

IF+/IF– (Pin 11/Pin 10): Open-Collector Differential IF

Output. These pins must be connected to the VCC supply

through impedance-matching inductors or a transformer

center tap. Typical DC current consumption is 27.5mA

into each pin.

LO (Pin 15): Single-Ended Local Oscillator Input. This

pin is internally connected to the primary winding of an

integrated transformer, which has low DC resistance to

ground. A series DC-blocking capacitor must be used to

avoid damage to the internal transformer. This input is

50Ω impedance matched from 1GHz to 4GHz, even when

the IC is disabled. Operation down to 300MHz or up to

4.5GHz is possible with external matching.

Block Diagram

1 TEMP

2 GND

16

15

14

GND LO

NC

LO

RF

3

RF

4 GND

BIAS

17 GND

(EXPOSED PAD)

EN

5

VCC NC

6

7

13

GND

GND 12

IF+ 11

IF– 10

GND 9

IADJ

8

5567 BD

5567f

9

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