BU1425AKV Rohm Semiconductor, BU1425AKV Datasheet - Page 31

• Manufacturer Part Number: BU1425AKV
• Description: IC ENCODER NTSC/PAL DGTL VQFP64
• Manufacturer: Rohm Semiconductor
• Type: NTSC/PAL Encoderr

Specifications of BU1425AKV

• Applications: Video
• Voltage - Supply, Analog: 4.5 V ~ 5.5 V
• Voltage - Supply, Digital: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(5) Adjustment of the DAC output level
The voltage level of the DAC output is determined by the
DAC internal output current and the DAC output external
resistor. The output current per 1 DAC bit is determined
by the external resistor of the IR pin (pin 42), as shown
below.
I (1LSB) = VVREF/RIR 1 / 16 [A] ... (equation 6-1)
VVREF ... Voltage generated by the regulator circuit in
RIR ... External resistor for the IR pin
Consequently, when VVREF = 1.3V and RIR = 1200 ,
a current of 67.71 A per 1LSB is output. Because the
white level of Y is a digital value of 396 (decimal value),
Multimedia ICs
Internal clock (BCLK)
HSY
Y-Data
U.V-Data
Internal clock (BCLK)
HSY
Y-Data
U.V-Data
the BU1425AK
[V]
0
0
1200[ ]
Fig. 26 YUV input timing when TEST[2] = H
Fig. 25 YUV input timing when TEST[2] = L
1
1
2
2
the following results:
V (Y white) = 0.0677 396 = 26.81mA
At this point, if the DAC output external resistance is
37.5 , an amplitude of 1.005V
(6) YUV input mode
With the BU1425AK, setting the IM0 pin (pin 23) to
HIGH enables a 16-bit YUV input format to be support-
ed. At that time, the timing of U and V can be reversed
when data is input, using the H / L state of the Test2
pin.
The input conditions for this mode are shown below.
2n
BU1425AK / BU1425AKV
2n + 1
Y1
U1
Y1
U1
2n
2n + 1
Y2
V1
Y2
V1
P-P
Y3
U3
Y3
U3
is obtained.
Y4
V3
Y4
V3
Y5
U5
Y5
U5
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