Hitachi Releases Industry's Smallest Analog Front-End
ICs for CCD Cameras
| Offering smaller size together with low noise and low
power consumption for use in digital cameras
| HD49334 Series
Analog Front-End ICs for CCD Camera
Tokyo, October 15, 2001- Hitachi, Ltd. (TSE: 6501) today announced the
HD49334 Series of CCD*1 camera analog front-end ICs, offering high performance,
low power consumption, and low cost, for use in digital cameras and
similar products. Four models have been developed, including the HD49334NP/HNP
in the industry's smallest QFN 36-pin package, and sample shipments
will begin on October 16, 2001 in Japan.
A CCD camera analog front-end IC processes analog images from a CCD
into digital signals that can be handled by a DSP or similar digital
image signal processing IC, and is a key device in determining the performance
of a CCD camera. With the major concern being the achievement of high
performance together with low power consumption, this new series offers
an approximately 3 dB S/N (Signal/Noise) improvement and approximately
20% lower power consumption than previous Hitachi products.
The total number of digital cameras shipped worldwide in 2000 was
13 million, a 125% increase over the previous year, and the forecast
for 2001 is 17 million units, an increase of 30% over 2000 (Hitachi
figure). With this growth in the demand for CCD camera products, including
digital still cameras and digital video cameras, there is fierce competition
among set manufacturers to achieve higher functionality and performance
at lower cost. Smaller size is another important requirement, and the
features demanded of ICs to be installed in such products are high performance,
low power consumption, and low cost, together with small size.
In response to these demands, Hitachi has employed its well-established
and highly rated analog design technologies to develop the four models
in the HD49334 Series.
A CCD camera analog front-end IC carries out the following kinds of
processing on analog images picked up by a CCD, to produce digital signals.
|| Noise elimination:
The noise component in a signal output by the CCD is eliminated
by a CDS circuit *2.
|| Signal amplification:
A weak CCD output signal is adjusted to an optimal level by
a PGA*3 circuit.
|| Conversion to digital
signals: Analog signals are digitized by
an ADC*4 circuit in order to be supplied to a later-stage
digital image signal processing IC.
[About these Products]
Major features of this new series are summarized below.
The CDS circuit achieves high-precision suppression of low-band
noise in signals received from the CCD, improving the S/N figure
by approximately 3 dB compared with Hitachi's current HD49325
Series. Also, there has long been a problem of the appearance
of false colors with photographic subjects for which there is
a gradual change in brightness. With this new series, a new approach
has been applied to the CCD camera analog front-end IC output
format, enabling an improvement of 6 dB or more (compared with
previous Hitachi products) in the false color phenomenon.
|| Lower power consumption
Optimization of the ADC circuitry and the power level of the amplifiers
within the IC has resulted in an approximately 20% reduction in
power consumption compared with Hitachi's current HD49325 Series.
|| Lower Cost
Functional optimization has made it possible to improve performance
while reducing the chip size, and so achieve lower cost.
|| Smaller Size
In addition to the well-established QFP 48-pin (9.0
9.0 1.7 (mm)) package
lineup, an ultra-small QFN 36-pin package (6.2
6.2 0.9 (mm))--an industry
first for a CCD camera analog front-end IC--has been newly developed
to meet the demand for smaller size. The QFN-36 package offers
an approximately 53% reduction in package area and 75% reduction
in cubic capacity compared with a QFP-48 package, enabling end-products
to be made smaller.
This new series offers a variety of operating frequencies and packages
to meet different user needs, with a lineup comprising the 25 MHz
HD49334F (QFP-48 package) and HD49334NP (QFN-36 package), and the
40 MHz HD49334HF (QFP-48 package) and HD49334HNP (QFN-36 package).
||CCD: Charge coupled devices
||CDS: Correlated double sampling
||PGA: Programmable gain amplifier
|| ADC: Analog-to-digital converter
< Typical Applications >
Digital still camera, digital video cameras, monitoring cameras, etc.
< Prices in Japan > (For Reference)
||Sample Price (Yen)
< Specifications >
| Product Code
| ADC precision
|| 10 bits (1.5-bit
| Differential/integral linearity
|| DNL : ±0.3LSB,
INL : 2LSBp-p
| Power supply voltage
| Power consumption
|| 66 mW typ.
(25 MHz operation, 3.0 V)
| 130 mW typ.
(40 MHz operation, 3.0 V)
| Operating frequency
| PGA gain control width
|| -2.36 dB to 31.40 dB /
| ADC input
|| ADC direct input supported
|| (1) Approx. 3 dB S/N improvement
compared with previous Hitachi products
(2) 6 dB or more false color improvement through use of new ADC
|WRITTEN BY Corporate Communications Division