WM2152
12-bit, 30MSPS ADC
Product Preview, March 2001, Rev 1.1
DESCRIPTION
The WM2152 is a high speed 12-bit analogue-to-digital
converter operating on a 3.3V supply. This device includes
a high bandwidth sample and hold and internal voltage
references. Conversion is controlled by a single clock input.
The device has a differential sample and hold input which
gives excellent common-mode noise immunity and low
distortion. The maximum differential input voltage can be
set by the user, via two mode selection pins, to be 1V or 2V.
A third PGA mode is designed particularly for single-ended
input signals such as composite video sources. Single-
ended input signals require one side of the differential input
to be tied to an external voltage source.
The device provides internal reference voltages for setting
the ADC full-scale range without the requirement for
external circuitry. The WM2152 can also accept external
reference levels for applications where common or high
precision references are required.
The WM2152 provides an out of range indicator flag to
indicate when the input signal exceeds the converter’s full
scale range. An output enable pin allows several devices to
share a common bus. Power down mode for the device is
under the control of the two mode control pins and takes
power consumption down to less than 36µW.
FEATURES
•
•
•
•
•
•
•
•
•
12-bit resolution ADC
30MSPS conversion rate
Programmable Gain Amplifier (PGA)
Out of range indicator
Low power - 160mW typical at 3.3V supplies
Powerdown mode to 30µW typical
66dB SNR for 3.58MHz input signal
-78db THD for 3.58MHz input signal
28-pin TSSOP package
APPLICATIONS
•
•
•
•
•
•
Direct IF sampling
Baseband digitisation
Video Digitisation
Portable instrumentation
Digital imaging
High speed data acquisition
BLOCK DIAGRAM
AVDD
(8, 27)
AVDD
(1,7)
CON0 (3)
CON1 (2)
CONFIGURATION
CONTROL CIRCUIT
TIMING
CONTROL
(28) CLK
VINP (5)
VINM (6)
+
PGA
-
ADC
OUTPUT
BUFFERS
D[11:0]
(12-18, 21-25)
(11) OVRNG
(26) OEB
EXTREF (4)
PRECISION
REFERENCE
CIRCUITS
(20) DVDD
WM2152
(9)
VRT
(10)
VRB
(19) DGND
WOLFSON MICROELECTRONICS LTD
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386
Fax: +44 (0) 131 667 5176
Email: sales@wolfson.co.uk
www.wolfsonmicro.com
Product Preview
data sheets contain
specifications for products in the formative
phase of development. These products may
be changed or discontinued without notice.
2001
Wolfson Microelectronics Ltd
.
WM2152
PIN CONFIGURATION
AGND
CON1
CON0
EXTREF
VINP
VINM
AGND
AVDD
VRT
VRB
OVRNG
D11
D10
D9
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
CLK
AVDD
OEB
D0
D1
D2
D3
D4
DVDD
DGND
D5
D6
D7
D8
Product Preview
ORDERING INFORMATION
DEVICE
XWM2152CDT
XWM2152IDT
TEMP. RANGE
0 to +70
o
C
-40 to +85
o
C
PACKAGE
28-pin TSSOP
28-pin TSSOP
PIN DESCRIPTION
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
NAME
AGND
CON1
CON0
EXTREF
VINP
VINM
AGND
AVDD
VRT
VRB
OVRNG
D11
D10
D9
D8
D7
D6
D5
DGND
DVDD
D4
D3
D2
D1
D0
OEB
AVDD
CLK
TYPE
Supply
Digital Input
Digital Input
Digital Input
Analogue Input
Analogue Input
Supply
Supply
Analogue I/O
Analogue I/O
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Supply
Supply
Digital Output
Digital Output
Digital Output
Digital Output
Digital Output
Digital Input
Supply
Digital Input
Mode control pin 1
Mode control pin 0
Reference select pin
Positive analogue input
Negative analogue input
Analogue ground
Analogue power supply
Upper ADC reference voltage
Lower ADC reference voltage
Out of range indicator
Data output bit 11 (MSB)
Data output bit 10
Data output bit 9
Data output bit 8
Data output bit 7
Data output bit 6
Data output bit 5
Digital ground
Digital power supply
Data output bit 4
Data output bit 3
Data output bit 2
Data output bit 1
Data output bit 0 (LSB)
Output enable (low = enable, high = disable)
Analogue Power Supply (for Timing Circuitry)
ADC conversion clock
DESCRIPTION
Analogue Ground (for Timing Circuitry)
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 March 2001
2
Product Preview
WM2152
ABSOLUTE MAXIMUM RATINGS
Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at
or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical
Characteristics at the test conditions specified.
ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible
to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage
of this device.
CONDITION
Digital supply voltage, DVDD to DGND
Input clock supply voltage, CLKVDD to CLKGND
Analogue supply voltage, AVDD to AGND
Maximum ground difference between AGND, DGND and CLKGND
Voltage range digital inputs
Voltage range analogue inputs
Voltage range CLK input
Operating junction temperature range, T
J
Storage temperature
Lead temperature (1.6mm from package body for 10 seconds)
MIN
-0.3V
-0.3V
-0.3V
-0.3V
DGND - 0.3V
AGND - 0.3V
CLKGND - 0.3V
-40°C
-65°C
MAX
+4.0V
+4.0V
+4.0V
+0.3V
DVDD + 0.3V
AVDD + 0.3V
CLKVDD + 0.3V
+150°C
+150°C
+300°C
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 March 2001
3
WM2152
ELECTRICAL CHARACTERISTICS
Test Conditions:
AVDD = DVDD = 3.3V, f
CLK
= 30MHz, EXTREF = AGND, Mode=1, T
A
= T
MIN
to T
MAX
, unless otherwise stated.
PARAMETER
DC Characteristics
Resolution
Integral Nonlinearity
Differential Nonlinearity
Missing Codes
Offset Error
Gain Error
Dynamic Performance
(Note 1)
Effective number of bits
ENOB
f
IN
=3.58MHz
f
IN
=10MHz
f
IN
=15MHz
Total harmonic distortion
THD
f
IN
=3.58MHz
f
IN
=10MHz
f
IN
=15MHz
SNR
f
IN
=3.58MHz
f
IN
=10MHz
f
IN
=15MHz
Signal to noise and distortion
ratio
Spurious free dynamic range
SINAD
f
IN
=3.58MHz
f
IN
=10MHz
f
IN
=15MHz
SFDR
f
IN
=3.58MHz
f
IN
=10MHz
f
IN
=15MHz
Differential phase
Differential gain
Input Span
DP
DG
Mode=1, VREF = 1V
Mode=2, VREF = 1V
Mode=3, VREF = 1V
Input (VINP or VINM) range
Input capacitance
Analogue input bandwidth
Power supply rejection ratio
Conversion Characteristics
Conversion frequency
Pipeline delay
Aperture delay
Aperture jitter
Internal Voltage References
(Note 3)
Upper reference voltage
Lower reference voltage
Differential reference voltage
(VRT-VRB)
Differential reference voltage
(VRT-VRB) accuracy
Power up time of references
from standby
WOLFSON MICROELECTRONICS LTD
t
PU
VRT
VRB
VREF
0.95
-5
100
2.15
1.15
1
1.05
+5
t
A
f
CLK
5
5
2.0
2.0
30
PSRR
C
IN
All modes
All modes
-0.5
-1
0
0
6
180
54
67
65.6
66
10.6
10.9
10.9
10.8
-76
-74
-72.5
68
68
67.7
67.4
67.4
66.6
78.1
76.4
74.6
0.12
0.01
0.5
1
1
AVDD
-65
INL
DNL
All modes
All modes
All modes
All modes
All modes
12
-2.5
±1.2
±0.4
0.5
0.5
+2
±1
1.2
3.5
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
Product Preview
UNIT
bits
LSB
LSB
%FSR
%FSR
bits
bits
bits
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
deg
%
V
V
V
V
pF
MHz
dB
MHz
cycles of
CLK
ns
ps rms
V
V
V
%
µs
No missing codes guaranteed
Analogue Input Signal to (VINP – VINM)
PP Rev 1.1 March 2001
4
Product Preview
Test Conditions:
AVDD = DVDD = 3.3V, f
CLK
= 30MHz, EXTREF = AGND, Mode=1, T
A
= T
MIN
to T
MAX
, unless otherwise stated.
PARAMETER
External Voltage References
Externally applied VRT
reference range
Externally applied VRB
reference range
Externally applied differential
reference range (VRT-VRB)
Reference Input Resistance
(VRT to VRB)
Digital Inputs / Outputs
Input LOW level
Input HIGH level
High level output voltage
Low level output voltage
High Impedance Output Current
Rise/Fall time
Power Supplies
CLKVDD supply current
AVDD supply current
DVDD supply current
Total supply current
Total supply current in standby
mode
Power consumption
Notes
1.
2.
3.
Input amplitudes for all single tone dynamic tests are all -0.5dBFS.
Inputs for two-tone IMD are 4.4MHz and 4.5MHz, each at -7dBFS.
The internal reference voltage is not intended for use driving off-chip.
I
AA1
I
AA2
I
DD
I
TOT
I
SB
f
CLK
= 30MHz
f
CLK
= 0MHz
f
CLK
= 30MHz
168
f
CLK
= 30MHz
3.0
3.3
35
10
48.3
10
220
3.6
C
LOAD
=10pF
5.5
V
IL
V
IH
V
OL
V
OH
I
OH
=50µA
I
OL
=-50µA
0.8 x VDD
DVDD-0.4
0.4
±1
0.2 x VDD
2
1.05
0.75
9
2.5
1.3
1.05
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
WM2152
UNIT
V
V
V
kΩ
V
V
V
V
µA
ns
mA
mA
mA
mA
µA
mW
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 March 2001
5
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