NSC ADC12EU050 Ultra-low power, octal, 12-bit, 40-50 msps analog-to-digital converter Datasheet

January 25, 2008
ADC12EU050
Ultra-Low Power, Octal, 12-bit, 40-50 MSPS Analog-toDigital Converter
General Description
Features
NOTE: This is Advance Information for a product currently in development. ALL specifications are design targets and are subject to change.
The ADC12EU050 is a 12-bit, ultra-low power, octal A/D converter for use in high performance analog to digital applications. The ADC12EU050 uses an innovative continuous time
sigma delta architecture offering ultra low power consumption
and an alias free sample bandwidth up to 25MHz. The input
stage of each channel features a proprietary system to ensure
instantaneous recovery from overdrive. Instant overload recovery (IOR) with no memory effect guarantees the elimination of phase errors resulting from out of range input signals.
The ADC12EU050 reduces interconnection complexity by using programmable serialized outputs which offer the industry
standard LVDS and SLVS modes. Power consumption of only
44mW per channel(@ 50MSPS) gives a total chip power consumption of 350mW. The ADC12EU050 can operate entirely
from a 1.2V supply, although a separate output driver supply
of up to 1.8V can be used. The device operates from -40 to
+85 °C and is supplied in a 10 x 10 mm2, 68 pin package.
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CT∑ΔADC architecture with 40-50MSPS throughput
Anti-alias filter free Nyquist sample range
Unique Instant Overload Recovery (IOR)
Wide 2.10 VPP input range
1.2V supply voltage
Integrated precision LC PLL
Serial control via SPI compatible interface
Key Specifications
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Resolution
Conversion Rate
SNR
THD
Power Consumption
12 Bits
40 to 50 MSPS
70 dBFS (typ) @ (fIN = 3.5MHz)
–70 dB (typ) @ (fIN = 3.5MHz)
44 mW/ch (typ) @ 50MSPS
40 mW/ch (typ) @ 40MSPS
Total Active Power
350 mW (typ) @ 50MSPS
Consumption
(Equalizer off)
>110 dB @ (fIN = 3.5MHz)
■ Inter-Channel Isolation
-40 to +85 °C
■ Operating Temp. Range
Applications
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© 2008 National Semiconductor Corporation
300511
Battery powered portable systems
Medical imaging, ultrasound
Industrial ultrasound, such as non-destructive testing
Communications
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ADC12EU050 Ultra-Low Power, Octal, 12-bit, 40-50 MSPS Analog-to-Digital Converter
ADVANCE INFORMATION
ADC12EU050
Block Diagram
30051102
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2
ADC12EU050
Connection Diagram
30051101
Ordering Information
Industrial (−40°C ≤ TA ≤ +85°C)
Package
ADC12EU050CILQ
68 Pin LLP
Note: The ADC12EU050 evaluation systems comprise a fully populated &
tested device board (DUT), a data capture card with USB 2.0 interface, a SPI control daughter board, Merlin® time and frequency
domain measurement software and 2 USB connection cables. The
ADC12EU050 evaluation kit is not compatible with National
Semiconductor’s Wavevision capture board and software.
3
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ADC12EU050
Pin Descriptions
Pin No.
Name
Type
Function and Connection
Input
Differential analog inputs to the ADC, for channels 0 to 7. The
negative input pin may be connected to AGND or the inputs may
be transformer coupled for single ended operation. A differential
input is recommended for best performance.
ANALOG I/O
2
3
67
68
64
65
61
62
58
59
55
56
52
53
49
50
VIN0+
VIN0VIN1+
VIN1VIN2+
VIN2VIN3+
VIN3VIN4+
VIN4VIN5+
VIN5VIN6+
VIN6VIN7+
VIN7-
4
VREFB
Optional negative reference voltage to improve multi-channel ADC
matching. If no reference is supplied, this pin must be connected
to AGND.
VREFT
Optional positive reference voltage to improve multi-channel ADC
matching. If using the internal reference, this pin should be left
unconnected. If using an external reference voltage, this pin should
be connected to the positive reference voltage, which must lie in
the range specified in the Electrical Characteristics table.
DCAP
Input
This pin provides the capacitance for the low pass filter in the
modulator’s DAC. It must be connected to AGND through a
minimum 100nF capacitor. It is possible to decrease the noise
close to the carrier by increasing this capacitor, up to a maximum
of 10μF.
RREF
Input/Output
External bias reference resistor. This pin must always be
connected to AGND through a resistor, whether the internal or an
external reference voltage is used. The resistor value must be
10kΩ ±1%.
RST
Input
This pin is an active low reset for the entire ADC, both analog and
digital components. The pin must be held low for 500ns then
returned to high in order to ensure that the chip is reset correctly.
Input
Sleep mode. Toggling this pin to high will cause the ADC to enter
the low power sleep mode. When the pin is returned to low, the
chip will, after the specified time to exit sleep mode, return to normal
operation.
5
6
7
DIGITAL I/O
9
10
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SLEEP
4
Name
15
16
18
19
20
21
23
24
25
26
28
29
31
32
33
34
DO0+
DO0DO1+
DO1DO2+
DO2DO3+
DO3DO4+
DO4DO5+
DO5DO6+
DO6DO7+
DO7-
36
37
BCLK+
BCLK-
ADC12EU050
Pin No.
Type
Function and Connection
Output
Differential Serial Outputs for channels 0 to 7. Each pair of outputs
provides the serial output for the specific channel. The default
output is LVDS format, but programming the appropriate control
registers, the output format can be changed to SLVS.
By programming TX_term (bit 4) in the LVDS Control register, it is
possible to internally terminate these outputs with 100 ohm
resistors.
Output
Bit clock. Differential output clock to be 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 100 ohm
resistors.
38
39
WCLK+
WCLK-
Output
Word Clock. Differential output frame clock. 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 100 ohm
resistors.
44
SDATA
Input/Output
SPI data input and output. This pin is used to send and receive SPI
address and data information. The direction of the pin is controlled
internally by the ADC based on the SPI protocol.
45
SCLK
Input
SPI clock. In order to use the SPI interface, a clock must be
provided on this pin. The maximum frequency of operation for the
serial interface is 1MHz.
46
SSEL
Input
SPI chip select. This active low pin is used to enable the serial
interface.
47
48
CLK+ (SE)
CLK-
Input
Differential Input Clock. The input clock must lie in the range of
40MHz to 50MHz. It is used by the PLL to generate the internal
sampling clocks. A single ended clock can also be used, and
should be connected to pin 47.
1, 8, 51, 54,
57, 60, 63, 66
VA
Power
Analog Power Supply. All pins should be connected to the same
1.2V supply, with voltage limits as in the Electrical Specification.
0
AGND
Ground
Analog Ground Return.
11, 12, 42, 43
VD
Power
Digital Power Supply. Connect to 1.2V, with voltage limits as in the
Electrical Specification.
13, 14, 22,
30, 40, 41
DGND
Ground
Digital and Output Driver Ground Return.
17, 27, 35
VDR
Power
Output Driver Power Supply. Can be connected to 1.2V – 1.8V,
depending on application requirements. Voltage limits are
described in more detail in the Electrical Specification.
POWER SUPPLY
5
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ADC12EU050
Physical Dimensions inches (millimeters) unless otherwise noted
TOP View...............................SIDE View...............................BOTTOM View
68-Lead LLP Package 10x10x1.0mm, 0.5mm Pitch
Ordering Numbers ADC12EU050CILQ
NS Package Number LQA68A
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ADC12EU050
Notes
7
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ADC12EU050 Ultra-Low Power, Octal, 12-bit, 40-50 MSPS Analog-to-Digital Converter
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