XWM2152CDT/V Ver la hoja de datos (PDF) - Wolfson Microelectronics plc
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XWM2152CDT/V Datasheet PDF : 13 Pages
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WM2152
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DEVICE DESCRIPTION
INTRODUCTION
The WM2152 (see Block Digram on Page 1) consists of:
• Programmable gain amplifier (PGA) including high bandwidth sample-and-hold. This is
configured using control pins CON0, CON1.
• 12-bit, 30MSPS pipeline analog-to-digital converter (ADC) core
• On-chip generation of the ADC references VRT and VRB (or external references can
be applied to these pins if EXTREF is set high)
• 12-bit parallel digital output, with separate supplies DVDD, DGND.
• Out-of-range output pin OVRNG goes high when the input signal exceeds the
converter’s range (positive or negative)
• The digital outputs, including OVRNG, are all set high-impedance if OEB is driven low.
CONFIGURATION DETAILS
The device is typically configured by tying pins CON0, CON1, and EXTREF high or low.
• There are no pull-offs on these inputs, so they must not be left floating.
• These inputs have protection diodes and input buffers connected to AVDD and AGND,
so they should be tied to AVDD or AGND, not DVDD or DGND.
INTERNAL/EXTERNAL REFERENCES
Pin EXTREF controls whether the ADC voltage references are generated internally, or whether these
are supplied externally (for applications where common or high precision references are required)
EXTREF
0
1
Mode of Operation
Internal References used
External References applied.
INPUT SIGNAL RANGE/POWER-DOWN
Pins CON0, CON1 power down the chip, or configure the PGA as follows:
MODE
0
1
2
3
CON1
0
0
1
1
CON0
0
1
0
1
Mode of Operation
Device Powered Down
Single Ended Mode / Differential Mode x1
Differential Mode x0.5
Single Ended Mode with Offset
Figure 6 illustrates the input signal ranges obtainable.
(a) Mode1 - single-ended input: VINM is held constant, VINP acts as a single-ended input with
zero-scale VINM-1V and full-scale VINM+1V. (Note VINP could be held constant and VINM
used as the input with zero-scale VINP+1V, full-scale VINP-1V).
(b) Mode 1 - differential: complementary inputs are applied to VINM and VINP. Zero scale when
VINP-VINM=-1V, full-scale when VINP+VINM=+1V.
(c) Mode 2 - differential mode x 0.5: as (b), but the PGA gain is reduced, so zero scale is now
wVINP-VINM=-2V, full-scale when VINP+VINM=+2V.
(d) Mode 3 - single-ended with offset: In mode 3 an offset is applied within the PGA, so now zero
scale is VINP=VINM, full-scale is when VINP=VIMN+1V. In this example, VINM is held
constant and VINP swings 1V. This mode is useful for positive-going video signals, for
example.
PP Rev 1.2 August 2001
8
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