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參數(shù)資料
| 型號(hào)： | ISL59834IRZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 5/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VIDEO FILTER CHRG PUMP 44-QFN |
| 標(biāo)準(zhǔn)包裝： | 43 |
| 應(yīng)用： | 濾波器 |
| 電路數(shù)： | 4 |
| -3db帶寬： | 9MHz |
| 電流 - 電源： | 28mA |
| 電流 - 輸出 / 通道： | 50mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 44-QFN-EP（7x7） |
| 包裝： | 管件 |
| 產(chǎn)品目錄頁面： | 1247 (CN2011-ZH PDF) |
13
FN6268.1
June 11, 2008
Description of Operation and Application Information
Theory of Operation
The ISL59834 is a single supply video driver with a
reconstruction filter and an on-board charge pump. It is
designed to drive SDTV displays with component (YPbPr),
S-video (Y-C), or composite video (CV) signals. The input
signals can be AC or DC-coupled. When AC-coupled, a sync
tip clamp sets the blank level to ground at the output of
Channel 1 and Channel 3. Keyed clamps force the average
levels of Channel 2 and Channel 4 to ground. The keyed
clamps force the outputs to ground when SYNC_INA or
SYNC_INB are driven to the logic high state. The ISL59834
outputs are capable of driving two AC or DC-coupled
standard video loads and have a 4th order Butterworth
reconstruction filter with nominal -3dB frequency set to
9MHz, providing 40dB of attenuation at 27MHz. The
ISL59834 is designed to operate with a single supply voltage
range ranging from 3.0V to 3.6V. This eliminates the need for
a split supply with the incorporation of two charge pumps
capable of generating a bottom rail as much as 1.5V below
ground; providing a 4.8V range on a single 3.3V supply. This
performance is ideal for NTSC video with negative-going
sync pulses.
Output Amplifier
The ISL59834 output amplifiers provide a gain of +6dB. The
output amplifiers are able to drive a 2.8VP-P video signal into
a 150
Ω or 75Ω load to ground.
The outputs are highly-stable, low distortion, low power, high
frequency amplifiers capable of driving moderate (~10pF)
capacitive loads.
Input/Output Range
The ISL59834 has a dynamic input range of 0 to 1.4VP-P
This allows the device to handle high amplitude video signal
inputs. As the input signal moves outside the specified
range, the output signal will exhibit increasingly higher levels
of harmonic distortion.
Charge Pump
The ISL59834 contains two charge pumps; charge pump A
supplies Channel 1 and 2, while charge pump B supplies
Channel 3 and 4. The ISL59834 charge pumps provide a
bottom rail up to 1.5V below ground while operating on a
3.0V to 3.6V power supply. The charge pumps are internally
regulated and are driven by internal 9.5MHz clocks. The
FIGURE 25. NOISE SPECTRUM
FIGURE 26. CHARGE PUMP FEEDTHROUGH AT AMPLIFIER
OUTPUT
FIGURE 27. THD (dBc) vs OUTPUT VOLTAGE (VP-P)
FIGURE 28. PACKAGE POWER DISSIPATION
Typical Performance Curves
VCP = VS = 3.3V, CF1 = CF2 = 0.1F, CS1 = CS2 = 0.22F, CFIL1 =CFIL2 = 0.4F, CIN1 = CIN2 =
CIN3 = CIN4 = 0.1F, RL1 =RL2 = 150Ω. (Continued)
0.1
1
10
100
0M
2M
4M
6M
8M
10M
FREQUENCY (Hz)
V/
√Hz
RMS NOISE = 2.87mV
OUTPUT REFERRED
CHARGE PUMP NOISE,
CONTRIBUTES ONLY A SMALL
PERCENTAGE OF THE
OVERALL NOISE
1M
3M
5M
7M
9M
TIME SCALE = 50ns/DIV
VERTICAL SCALE = 20mV/DIV
-70
-60
-50
-40
-30
-20
-10
0
0.5
0.8
1.1
1.4
1.7
2.0
OUTPUT VOLTAGE (V)
THD
(
d
Bc
)
fIN = 5MHz
fIN = 500kHz
VS = VCP = +3.3V
RL = 150Ω
VOUT = 0 TO 2VP, SINE WAVE
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
0
5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
AMBIENT TEMPERATURE (°C)
POWER
DISS
IP
A
T
ION
(W)
44 LD QFN PACKAGE
7mmx7mm
θ
JA = +32°C/W
ISL59834
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