6 Pin Configuration and Functions

Figure 6-1 LMK1D1208I: RHA Package 40-Pin VQFN (Top View)

Table 6-1 Pin Functions

PIN		TYPE⁽¹⁾	DESCRIPTION
NAME	LMK1D1208I	TYPE⁽¹⁾	DESCRIPTION
DIFFERENTIAL/SINGLE-ENDED CLOCK INPUT
IN0_P, IN0_N	12, 13	I	Primary: Differential input pair or single-ended input
IN1_P, IN1_N	8, 9	I	Secondary: Differential input pair or single-ended input.
I²C PROGRAMMING
SDA	5	I/O	I²C data
SCL	6	I	I²C clock
IDX0	15	I,S,PU	I²C address bit[0]. This is a 2-level input that is decoded in conjunction with pin 15 to set the I²C address. It has internal 670-kΩ pullup.
IDX1	16	I,S, PU	I²C address bit[1]. This is a 2-level input that is decoded in conjunction with pin 16 to set the I²C address. It has internal 670-kΩ pullup.
BIAS VOLTAGE OUTPUT
V_{AC_REF0}, V_{AC_REF1}	14, 10	O	Bias voltage output for capacitive coupled inputs. If used, TI recommends using a 0.1-µF capacitor to GND on this pin.
DIFFERENTIAL CLOCK OUTPUT
OUT0_P, OUT0_N	18, 19	O	Differential LVDS output pair number 0
OUT1_P, OUT1_N	22, 23	O	Differential LVDS output pair number 1
OUT2_P, OUT2_N	24, 25	O	Differential LVDS output pair number 2
OUT3_P, OUT3_N	28, 29	O	Differential LVDS output pair number 3
OUT4_P, OUT4_N	32, 33	O	Differential LVDS output pair number 4
OUT5_P, OUT5_N	34, 35	O	Differential LVDS output pair number 5
OUT6_P, OUT6_N	38, 39	O	Differential LVDS output pair number 6
OUT7_P, OUT7_N	2, 3	O	Differential LVDS output pair number 7
SUPPLY VOLTAGE
V_DD	11, 20, 40	P	Device power supply (1.8 V, 2.5 V, or 3.3 V)
GROUND
DAP	DAP	G	Die Attach Pad. Connect to the printed circuit board (PCB) ground plane for heat dissipation.
NO CONNECT
NC	1, 4, 7, 17, 21, 26, 27, 30, 31, 36, 37	—	No connection. Leave floating.

(1) The definitions below define the I/O type for each pin.

I = Input
O = Output
I / O = Input / Output
PU = Internal 670-kΩ Pullup
S = Hardware Configuration Pin
P = Power Supply
G = Ground