A/D Converter. ADC12QS065 Datasheet

ADC12QS065 Converter. Datasheet pdf. Equivalent

ADC12QS065 Datasheet
Recommendation ADC12QS065 Datasheet
Part ADC12QS065
Description Quad 12-Bit 65 MSPS A/D Converter
Feature ADC12QS065; PRELIMINARY www.DataSheet4U.com November 2005 ADC12QS065 Quad 12-Bit 65 MSPS A/D Converter with LVD.
Manufacture National Semiconductor
Datasheet
Download ADC12QS065 Datasheet




National Semiconductor ADC12QS065
PRELIMINARY
wwNwov.DeamtbaeSrh2e0e0t45U.com
ADC12QS065
Quad 12-Bit 65 MSPS A/D Converter with LVDS
Serialized Outputs
General Description
This is Preliminary Information for a product currently in
development. ALL specifications are design targets and
are subject to change.
The ADC12QS065 is a low power, high performance CMOS
4-channel analog-to-digital converter with LVDS serialized
outputs. The ADC12QS065 digitizes signals to 12 bits reso-
lution at sampling rates up to 65 MSPS while consuming a
typical 200 mW/ADC from a single 3.0V supply. Sampled
data is transformed into high speed serial LVDS output data
streams. Clock and frame LVDS pairs aid in data capture.
The ADC12QS065’s six differential pairs transmit data over
backplanes or cable and also make PCB design easier. In
addition, the reduced cable, PCB trace count, and connector
size tremendously reduce cost.
No missing codes performance is guaranteed over the full
operating temperature range. The pipeline ADC architecture
achieves >11 Effective Bits over the entire Nyquist band at
65 MSPS.
The ADC12QS065 output pins can be put into a high imped-
ance state. The serializer PLL can lock to frequencies be-
tween 20 MHz and 65 MHz.
When not converting, power consumption can be reduced by
pulling the PD (Power Down) pin high, placing the converter
into a low power state where it typically consumes less than
3 mW total, and from which recovery is less than 5 ms. The
ADC12QS065’s speed, resolution and single supply opera-
tion makes it well suited for a variety of applications in
ultrasound, imaging, video and communications. Operating
over the industrial (-40˚C to +85˚C) temperature range, the
ADC12QS065 is available in a 64 pin TQFP package.
Features
n Single +3.0V supply operation
n Internal sample-and-hold
n Internal reference
n Low power consumption
n Power down mode
n Clock and Data Frame Timing
n 780 Mbps serial LVDS data rate (at 65 MHz clock)
n LVDS serial output rated for 100 Ohm load
Key Specifications
n Resolution
n DNL
n SNR (fIN = 10 MHz)
n SFDR (fIN = 10 MHz)
n ENOB (at Nyquist)
n Power Consumption
n -- Operating, 65 MSPS, per ADC
n -- Power Down Mode
12 Bits
±0.3 LSB (typ)
68.5 dB (typ)
85 dB (typ)
11 Bits (typ)
200 mW (typ)
< 3 mW (typ)
Applications
n Ultrasound
n Medical Imaging
n Communications
n Portable Instrumentation
n Digital Video
Connection Diagram
© 2005 National Semiconductor Corporation DS201068
20106801
www.national.com



National Semiconductor ADC12QS065
Ordering Information
Industrial (−40˚C TA +85˚C)
ADC12QS065CIVS
ADC12QS065EVAL
Block Diagram
Package
64 Pin TQFP
Evaluation Board
www.DataSheet4U.com
www.national.com
20106802
2



National Semiconductor ADC12QS065
Pin Descriptions
Pin No.
ANALOG I/O
3
7
10
14
4
6
11
13
Symbol
VIN1+
VIN2+
VIN3+
VIN4+
VIN1-
VIN2-
VIN3-
VIN4-
24 VREF
59
22
58
23
60
21
32,49
DIGITAL I/O
55
56
57
31
25
26
46
44
36
34
VREFT12
VREFT34
VCOM12
VCOM34
VREFB12
VREFB34
VREG
CLK
CLKB
INTREF
DEN
PD
REFPD
DO1+
DO2+
DO3+
DO4+
Description
www.DataSheet4U.com
Differential analog input pins. With a 1.0V reference voltage the differential
full-scale input signal level is 2.0 VP-P with each input pin voltage centered on a
common mode voltage, VCOM. The negative input pins may be connected to
VCOM for single-ended operation, but a differential input signal is required for
best performance.
This pin is the reference select pin and the external reference input, used in
conjunction with the INTREF pin.
If the INTREF pin is set to VA , this pin is used as an internal reference select.
With VREF = VA, the internal 1.0V reference is selected. With VREF=AGND, the
internal 0.5V reference is selected.
If the INTREF pin is set to AGND, then this pin is the input for an external
reference. A voltage in the range of 0.8 to 1.2V may be applied to this pin. VREF
should be bypassed to AGND with a 1.0 µF capacitor when an external
reference is used.
Top ADC Reference. This pin has to be driven to 1.9V if REFPD is high.
If REFPD is low, bypass this pin with a 0.1 µF low ESR capacitor to AGND and
a 10 µF low ESR capacitor to VREFB.
This is an analog output which can be used as a common mode voltage for the
inputs. It should be bypassed to AGND with a minimum of a 1.0 µF low ESR
capacitor in parallel with a 0.1 µF capacitor. Pin 23 may also be used as a 1.5V
temperature stable reference voltage.
Bottom ADC Reference. This pin has to be driven to 0.9V if REFPD is high.
If REFPD is low, bypass this pin with a 0.1 µF low ESR capacitor to AGND and
a 10 µF low ESR capacitor to VREFT.
These are bypass pins for the internal 1.8V regulator. Each pin should be
bypassed to AGND with a 1.0 µF capacitor
This pin acts as either a Non-Inverting Differential Clock input or a CMOS clock
input. If CLKB is used as the Inverting Clock input, CLK will act as the
Non-Inverting Clock input. If CLKB is tied to AGND, CLK will act as a CMOS
clock input. ADC power consumption will increase by about 40mW if a
Differential Clock is used.
Inverting Differential Clock input. If tied to AGND, CLK acts as a CMOS clock
input.
Internal reference enable input. When this pin is high, two internal reference
choices are selectable through the VREF pin. When this pin is low, an external
reference must be applied to VREF (pin 24).
Serial Data Output Enable. TTL level input. A low, puts the LVDS outputs in
High-Impedance State.
Power Down pin that, when high, puts the converter into the Power Down mode.
With REFPD high, user must drive VREFT12, VREFT34 and VREFB12 &
VREFB34 externally. With REFPD low, VREFT12, VREFT34 and VREFB12 &
VREFB34 are driven internally.
+ Serial Data Output. Non-inverting LVDS differential output.
3 www.national.com







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)