lm96511ccsm National Semiconductor Corporation, lm96511ccsm Datasheet - Page 8

• Manufacturer Part Number: lm96511ccsm
• Description: Lm96511 Ultrasound Receive Analog Front End Afe
• Manufacturer: National Semiconductor Corporation

www.national.com
A30
A29
A32
A31
U25
V26
V22
V21
U23
V23
B3
B4
A5
A4
(Row_Column)
Ball Id.
ADC VREF GND
ADC CW/DVGA
AMP SPI™ CS
ADC SPI™ CS
ADC LPF BYP
ADC WCLK+
ADC WCLK-
ADC BCLK+
__________
__________
ADC BCLK-
ADC VREF
ADC RREF
SPI™ CLK
SPI™ DIO
Pin Name
ADC RST
_______
Input/Output
SPI™ Compatible Interface
Function
Bypass
Output
Output
Input
Input
Input
Input
ADC Controls
8
Description
Word Clock. Differential output frame clock used to indicate the bit
boundary of each data sample. Information on timing can be seen
in the Electrical Specifications section of the datasheet. By
programming TX_term (bit 4) in the LVDS Control register, it is
possible to internally terminate these outputs with 100Ω resistors.
Bit clock. Differential output clock used for sampling the serial
outputs. Information on timing can be seen in the Electrical
Specifications section of the datasheet. By programming TX_term
(bit 4) in the LVDS Control register, it is possible to internally
terminate these outputs with 100Ω resistors.
This pin is an active low reset for the entire ADC, both analog and
digital components. The pin must be held low for 500 ns then
returned to high in order to ensure that the chip is reset correctly.
0 = B-mode
1 = CW DOPPLER mode, PLL and References are still active to
minimize recovery time.
ADC Optional External Reference Voltage; Improves channel-to-
channel and converter-to-converter matching.
If Internal Reference is used, connect to AGND.
External 10k ±1% resistor to ADC Analog GND. Used to set
internal bias currents. Required regardless of the type of reference
used.
Capacitor required by the Modulator DAC's LP Filter. Must be at
least 100 nF to ADC Analog GND. Can be increased to 10 µF to
minimize close-in phase noise.
SPI™ clock
SPI™ Data Input/Output
0 = ADC SPI™ Chip Select
0 = Amplifier SPI™ Chip Select.