- 您现在的位置：买卖IC网 > PDF目录381719 > DS1381 (DALLAS SEMICONDUCTOR) NV RAMport(非易失性RAM口) PDF资料下载
参数资料
| 型号： | DS1381 |
| 厂商： | DALLAS SEMICONDUCTOR |
| 元件分类： | DRAM |
| 英文描述： | NV RAMport(非易失性RAM口) |
| 中文描述： | 2K X 8 NON-VOLATILE SRAM, 100 ns, PDIP24 |
| 文件页数： | 9/16页 |
| 文件大小： | 353K |
| 代理商： | DS1381 |
BUF04
REV. 0
–9–
FUNCTIONAL DESCRIPTION
The BUF04 is a closed-loop voltage buffer based on a current
feedback architecture. Its high open-loop transimpedance, high
output current drive capability, and its low input offset voltage
makes it useful in a variety of applications, such as buffering the
inputs of sampling and flash A/D converters, audio and video
line drivers, active filters, and precision op amp hoosters.
A transistor-level equivalent circuit for the BUF04 is illustrated
in Figure 29. The input stage consists of a pair of emitter
follower transistors, Q1 and Q2, whose outputs drive a second
set of transistors, Q3 and Q4. The emitters of Q3 and Q4 are
connected together through diodes, D1 and D2, to form a low
impedance input for the feedback signal (in current mode) from
the output stage. The outputs of Q3 and Q4 are then
“mirrored” to Q5 and Q6 which form the gain stage of the
BUF04. The signal is taken from the collectors of Q5 and Q6
which drive a “Darlington-connected” output stage made up of
transistors Q7-Q10. Three R-C networks (R1–C1, R2–C2, and
R3–C3) form feed-forward paths which bypass certain sections
of the BUF04 for improved high frequency performance and
capacitive load drive capability. Since the signal conveyed
internally in the BUF04 is a current, the frequency response
and slew rate of the BUF04 are insensitive to supply voltage
variations.
12
0
–12
10k
100k
1000M
100M
10M
1M
FREQUENCY – Hz
3
6
9
–9
–6
–3
G
V
S
= ±15V
T
A
= +25
°
C
R
L
= 150
C
L
= 100pF
C
L
= 50pF
C
L
= 0pF
150
CL
10
BUF04
Figure 28. Bandwidth vs. Frequency
Q11
Q13
Q5
Q3
Q7
Q9
Q2
Q1
C1
C3
R3
D2
D1
Q4
R2
Q10
Q8
Q6
Q14
Q12
V
IN
V
OUT
C2
R
FB
100
20
20
Figure 29. Transistor-Level Equivalent Circuit
An interesting feature of the BUF04 architecture is the use of
“slew-enhancement” transistors, Q11–Q14. Under normal small
signal (V
IN
< 2 V
be
s) conditions, these transistors are normally
“OFF.” In large signals, high speed transient applications where
the input signal is > 2 V
be
s, these transistors turn on and literally
“brute-force” the output to follow the input. When the input
signal drops below 2 V
be
s, the transistors return to their
normally “OFF” state.
10
100
0%
90
50mV
10ns
50mV
INPUT
(50mV/DIV)
OUTPUT
(50mV/DIV)
V
S
= ±15V, R
L
= 2k
, C
L
= 15pF
Figure 25. Small-Signal Transient Response
10
100
0%
90
2V
50ns
2V
INPUT
(2V/DIV)
OUTPUT
(2V/DIV)
V
S
= ±15V, R
L
= 2k
, C
L
= 15pF
DLY 375.0ns
Figure 26. Large-Signal Transient Response
0.1
0.010
0.001
D
0.0001
20
100
1k
10k
20k
07 MAR 93 21:31:53
AUDIO PRECISION BUF04 THD+N (%) vs FREQ (Hz)
T
A
B
C
VS= ±15V
LPF=80kHz
: VIN = 0.775Vrms, RL= 150W
: VIN = 0.775Vrms, RL= 600W
A : VIN = 7.75Vrms, RL= 150W
B : VIN = 7.75Vrms, RL= 600W
B
A
C
D
C
D
Figure 27. THD + Noise vs. Amplitude
相关PDF资料 |
PDF描述 |
|---|---|
| DS1384 | Watchdog Timekeeping Controller(看门狗计时器芯片) |
| DS1386 | Nonvolatile Static RAM with a Full Function Real Time Clock (RTC),(带完整功能的实时时钟静态RAM) |
| DS1386P | RAMified Watchdog Timekeeper(带完整功能的实时时钟静态RAM) |
| DS1388Z-3 | The CAT24FC02 is a 2-kb Serial CMOS EEPROM internally organized as 256 words of 8 bits each |
| DS1390-DS1393 | RIBBON CABLE, 34WAY, PER M; Cores, No. of:34; Conductor make-up:7/36AWG; Wire size, AWG:28AWG; Impedance:119R; Pitch:1.27mm; Voltage rating, AC:50V; Colour:Grey; Capacitance:70.5pF/m; Approval Bodies:UL; Approval category:Style RoHS Compliant: Yes |
相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1384 | 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:Watchdog Timekeeping Controller |
| DS1384FP | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Watchdog Timekeeping Controller |
| DS1384FP-12 | 功能描述:IC CTRLR RTC WDOG 120NS 44-MQFP RoHS:否 类别:集成电路 (IC) >> 时钟/计时 - 实时时钟 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- 类型:时钟/日历 特点:警报器，闰年，SRAM 存储容量:- 时间格式:HH:MM:SS（12/24 小时） 数据格式:YY-MM-DD-dd 接口:SPI 电源电压:2 V ~ 5.5 V 电压 - 电源，电池:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-WDFN 裸露焊盘 供应商设备封装:8-TDFN EP 包装:管件 |
| DS1384FP-12+ | 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| DS1384FP-120 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Real-Time Clock |
发布紧急采购，3分钟左右您将得到回复。