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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. Singleended 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 36W.
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 30W 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
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ORDERING INFORMATION
DEVICE XWM2152CDT XWM2152IDT TEMP. RANGE 0 to +70oC -40 to +85oC 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, TJ 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 -40C -65C
MAX +4.0V +4.0V +4.0V +0.3V DVDD + 0.3V AVDD + 0.3V CLKVDD + 0.3V +150C +150C +300C
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 March 2001
3
WM2152 ELECTRICAL CHARACTERISTICS
Test Conditions: AVDD = DVDD = 3.3V, fCLK = 30MHz, EXTREF = AGND, Mode=1, TA = TMIN to TMAX, 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 fIN =3.58MHz fIN =10MHz fIN =15MHz Total harmonic distortion THD fIN =3.58MHz fIN =10MHz fIN =15MHz SNR fIN =3.58MHz fIN =10MHz fIN =15MHz Signal to noise and distortion ratio Spurious free dynamic range SINAD fIN =3.58MHz fIN =10MHz fIN =15MHz SFDR fIN =3.58MHz fIN =10MHz fIN =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 tPU VRT VRB VREF 0.95 -5 100 2.15 1.15 1 1.05 +5 tA fCLK 5 5 2.0 2.0 30 PSRR CIN 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 % s
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, fCLK = 30MHz, EXTREF = AGND, Mode=1, TA = TMIN to TMAX, 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. IAA1 IAA2 IDD ITOT ISB fCLK = 30MHz fCLK = 0MHz fCLK = 30MHz 168 fCLK = 30MHz 3.0 3.3 35 10 48.3 10 220 3.6 CLOAD=10pF 5.5 VIL VIH VOL VOH IOH=50A IOL=-50A 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 k
V V V V A ns mA mA mA mA A mW
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 March 2001
5
WM2152 TYPICAL SYSTEM PERFORMANCE
1
AVDD = DVDD = 3.3V, fS = 30MSPS
Product Preview
0.75 Differential Non-Linearity (LSBs) 0.5 0.25 0 -0.25 -0.5 -0.75 -1 0 512 1024 1536 2048 DIGITAL CODE 2560 3072 3584 4096
Figure 1 Differential Non-Linearity
1
AVDD = DVDD = 3.3V, fS = 30MSPS
0.75
Integral Non-Linearity (LSBs)
0.5
0.25
0
-0.25
-0.5
-0.75
-1 0 512 1024 1536 2048 DIGITAL CODE 2560 3072 3584 4096
Figure 2 Integral Non-Linearity
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 March 2001
6
Product Preview
WM2152
PACKAGE DIMENSIONS
DT: 28 PIN TSSOP (9.7 x 4.4 x 1.0 mm) DM022.A
b
28
e
15
E1
E
GAUGE PLANE 1 14
D 0.25 c A A2 A1 -C0.1 C
SEATING PLANE
L
Symbols A A1 A2 b c D e E E1 L REF: MIN ----0.05 0.80 0.19 0.09 9.60
4.30 0.45 o 0
Dimensions (mm) NOM --------1.00 --------9.70 0.65 BSC 6.4 BSC 4.40 0.60 ----JEDEC.95, MO-153
MAX 1.20 0.15 1.05 0.30 0.20 9.80
4.50 0.75 o 8
NOTES: A. ALL LINEAR DIMENSIONS ARE IN MILLIMETERS. B. THIS DRAWING IS SUBJECT TO CHANGE WITHOUT NOTICE. C. BODY DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSION, NOT TO EXCEED 0.25MM. D. MEETS JEDEC.95 MO-153, VARIATION = AE. REFER TO THIS SPECIFICATION FOR FURTHER DETAILS.
WOLFSON MICROELECTRONICS LTD
PP Rev 1.1 March 2001
7

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