TI-LM98519.pdf
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OSR1
OSR2
Input
Bias
Input
Bias
Σ
Σ
CDS/
SH
PGA
FDAC
CDAC
CDS/
SH
PGA
+/- 10
+/- 4
ADC
M
U
X
8
White Level Loop
Black Level Loop
10 10
White Level Loop
Black Level Loop
8
+/- 10
+/- 4
Red
CDAC
FDAC
1x or 2.1x gain
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LM98519
SNAS425C –OCTOBER 2007–REVISED OCTOBER 2014
LM98519 10-bit 65 MSPS 6 Channel Imaging Signal Processor
1 Features 3 Description
The LM98519 is a fully integrated, high performance
1
• 3.3-V Single Supply Operation
10-Bit, 65 MSPS signal processing solution for digital
• CDS or S/H Processing with Negative Input Signal
color copiers, scanners, and other image processing
Polarity
applications. High-speed signal throughput is
• 32.5-MHz Channel Rate
achieved with an innovative six channel architecture
utilizing Correlated Double Sampling (CDS), or
• Enhanced ESD Protection on Host Interface Pins:
Sample and Hold (SH) type sampling. 1x or 2x gain
SHP, SHD, CLPIN, BLKCLP, AGC_ONB, MCLK,
settings are available in the CDS/SH input stage.
RESETB, SENB, SCLK, SDI, SDO
Each channel has a dedicated 1x to 10x (8 bit) PGA
• Low Power CMOS Design
that allows accurate gain adjustment of each channel.
• 4-Wire Serial interface The Digital White Level auto calibration loop can
automatically set the PGA value to achieve a
• 2 Channel Symmetrical Architecture
selected white target level. Each channel also has a
• Independent Gain and Offset Correction for Each
±4-bit coarse and ±10-bit fine analog offset correction
Channel
DAC that allows offset correction before the sample-
• Digital Black Level Calibration for Each Channel
and-hold amplifier. These correction values can be
controlled by an automated Digital Black Level
• Digital White Level Calibration for Each Channel
correction loop. The PGA and offset DACs for each
• Programmable Input Clamp
channel are programmed independently allowing
unique values of gain and offset for each of the six
2 Applications
channels. A 2-to-1 multiplexing scheme routes the
signals to three 65-MHz high performance ADCs. The
• Digital Color Copiers
fully differential processing channels achieve
• Scanners
exceptional noise immunity, having a very low noise
• Image Processing Polarity applications
floor of -67.5 dB. The 10-bit analog-to-digital
converters have excellent dynamic performance
• Key Specifications
making the LM98519 transparent in the image
– Maximum Input Level:
reproduction chain.
– 1.19 Vp-p (CDS Gain = 1.0)
– 0.58 Vp-p (CDS Gain = 2.1) Device Information
(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
– Input Sample Rate:
LM98519 TQFP (80) 12.00 mm × 12.00 mm
– 5 to 32.5 MSPS – 6ch Mode
(1) For all available packages, see the orderable addendum at
– 10 to 32.5 MSPS – 3ch Mode
the end of the datasheet.
– PGA Gain Range: 1x to 10x (0 to 20 dB)
– CDS/SH Gain Settings: 1x or 2.1x
Simplified Schematic
– Total Channel Gain: 1x to 20x (0 to 26 dB)
– PGA Gain Resolution: 8 Bits – Analog
– ADC Resolution: 10 Bits
– ADC Sampling Rate: 10 to 65 MSPS
– SNR: 67.5 dB (Gain = 1x)
– Offset DAC Range:
– ±111 mV or ±60 mV – FDAC
– ±277 mV – CDAC
– Offset DAC Resolution:
– ±10 Bits – FDAC
– ±4 Bits – CDAC
– Supply Voltage: 3.0 V to 3.6 V
– Power Dissipation: 1.04 W (Typical)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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