LMH1208: 超高清UHD-SDI双路电缆驱动器技术文档

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"TI-LMH1208.pdf" LMH1208是一款由德州仪器(Texas Instruments)生产的高性能超高清(UHD)串行数字接口(SDI)双通道电缆驱动器。这款集成电路专为需要高数据速率传输的广播级视频应用而设计，支持多种SDI标准，包括ST-2082-1 (12G-SDI)，ST-2081-1 (6G-SDI)，ST-424 (3G-SDI)，ST-292 (HD-SDI)以及ST-259 (SD-SDI)。此外，它还兼容DVB-ASI和AES10 (MADI)音频标准。 LMH1208的主要特性包括： 1. 双通道输出：该器件能够同时驱动两个差分输出通道，适用于需要高带宽、低失真信号传输的应用。 2. 内置75Ω终端和回损补偿网络：这可以优化信号完整性，减少信号反射和损失，确保在长距离传输时保持高质量信号。 3. 主机端均衡100Ω环回输出：此功能允许对信号进行均衡处理，以适应不同的电缆条件和系统需求。 4. 可编程压摆率控制和预加重/输出振幅：用户可以通过配置来调整75Ω输出的压摆率、预加重和输出振幅，以优化信号质量。 5. 100Ω输出端的去加重和输出振幅控制：与75Ω输出类似，但针对不同的负载特性，可以实现最佳信号传输效果。 6. 极性反转功能：允许用户翻转75Ω和100Ω输出端的信号极性，以适应不同接口的要求。 7. 自动节能模式：在无输入信号时，LMH1208会自动进入低功耗模式，降低待机功率消耗。 8. 电源管理：通过ENABLE引脚可以实现电源的开启和关闭，便于系统电源管理。 9. 单电源操作：支持2.5V电源，典型工作电流约为80mA，对应200mW的功耗。设计时，工程师应参考TI提供的英文原版数据手册(SNLS569)以获取最准确和最新的技术信息。TI不保证中文版本的翻译准确性，因此在实际设计中，必须依赖英文版数据手册以确保设计符合规格要求。 LMH1208是一款高效、灵活的SDI电缆驱动器，适用于广播、专业视频和音频系统，其丰富的可配置选项使得它能够适应各种复杂的传输环境，保证信号质量和可靠性。在使用过程中，配合适当的PCB布局和匹配电路，能够实现最佳的系统性能。

LMH1208

www.ti.com.cn

ZHCSKE0B –MARCH 2017 –REVISED OCTOBER 2019

Electrical Characteristics (continued)

over operating free-air temperature range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

(2) V

OVERSHOOT

overshoot and undershoot maximum measurements are largely affected by the PCB layout and input test pattern. The

maximum value specified in Electrical Characteristics for V

OVERSHOOT

is based on bench evaluation across temperature and supply

voltages with the LMH1297EVM.

VOD

CD_OUTP

Output single-ended output

voltage

Measure AC signal at SDI_OUT1+ and

SDI_OUT2+, with SDI_OUT1– and

SDI_OUT2– AC terminated with 75 Ω

SDI_VOD = H

840 mVp-p

SDI_VOD = F 720 800 880 mVp-p

SDI_VOD = R 880 mVp-p

SDI_VOD = L 760 mVp-p

VOD

CD_OUTN

Output single-ended output

voltage

Measure AC signal at SDI_OUT1– and

SDI_OUT2-, with SDI_OUT1+ and

SDI_OUT2+ AC terminated with 75 Ω

SDI_VOD = H

840 mVp-p

SDI_VOD = F 720 800 880 mVp-p

SDI_VOD = R 880 mVp-p

SDI_VOD = L 760 mVp-p

PRE

CD_OUTP

Output pre-emphasis

Output pre-emphasis boost amplitude at

SDI_OUT1+ and SDI_OUT2+, programmed

to maximum setting through register,

measured at SDI_VOD = F

2 dB

PRE

CD_OUTN

Output pre-emphasis

Output pre-emphasis boost amplitude at

SDI_OUT1– and SDI_OUT2–, programmed

to maximum setting through register,

measured at SDI_VOD = F

2 dB

R_F_SDI

Output rise and fall time

(1)

Measured with PRBS10 pattern, default

VOD at 20% – 80% amplitude, default pre-

emphasis enabled

11.88 Gbps

34 42 ps

5.94 Gbps 36 43 ps

2.97 Gbps 59 67 ps

1.485 Gbps 60 73 ps

270 Mbps 400 550 700 ps

R_F_DELTA

Output rise and fall time

mismatch

(1)

Measured with PRBS10 pattern, default

VOD at 20% – 80% amplitude, default pre-

emphasis enabled

11.88 Gbps

3 18 ps

5.94 Gbps 2.7 12 ps

2.97 Gbps 0.8 11 ps

1.485 Gbps 0.8 12 ps

270 Mbps 72 150 ps

OVERSHOOT

Output overshoot or undershoot

Measured with PRBS10 pattern, default

VOD, default pre-emphasis enabled

(2)

12G/6G/3G/HD/SD

DC_OFFSET

DC offset 12G/6G/3G/HD/SD ±0.2 V

DC_WANDER

DC wander

12G/6G/3G/HD/SD with EQ pathological

pattern

20 mV

CD_S22

Output return loss at

SDI_OUT1+ and SDI_OUT2+

reference to 75 Ω

(1)

S22, 5 MHz to 1.485 GHz –25 dB

S22, 1.485 GHz to 3 GHz –22 dB

S22, 3 GHz to 6 GHz –12 dB

S22, 6 GHz to 12 GHz –8 dB

LMH1208

ZHCSKE0B –MARCH 2017–REVISED OCTOBER 2019

www.ti.com.cn

Electrical Characteristics (continued)

over operating free-air temperature range (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

DRIVER OUTPUT (OUT0±)

OUT0_TERM

DC output differential

termination

Measured across OUT0+ and OUT0– 80 100 120 Ω

VOD

OUT0

Output differential voltage at

OUT0±

Measured with 8T pattern

HOST_EQ0 = H

410 mVp-p

HOST_EQ0 = F 485 560 620 mVp-p

HOST_EQ0 = R 635 mVp-p

HOST_EQ0 = L 810 mVp-p

VOD

OUT0_DE

De-emphasized output

differential voltage at OUT0±

Measured with 8T pattern

HOST_EQ0 = H

410 mVp-p

HOST_EQ0 = F 550 mVp-p

HOST_EQ0 = R 545 mVp-p

HOST_EQ0 = L 532 mVp-p

Output rise and fall time

Measured with 8T Pattern, 20% – 80%

amplitude

45 ps

OUT0-SDD22

Output differential return loss

(1)

Measured with the device powered up and

outputs a 10-MHz clock signal

SDD22, 10 MHz – 2.8 GHz

–24 dB

SDD22, 2.8 GHz – 6 GHz –16 dB

SDD22, 6 GHz – 11.1 GHz –15 dB

OUT0-SCC22

Output common-mode return

loss

(1)

Measured with the device powered up and

outputs a 10-MHz clock signal.

SCC22, 10 MHz – 4.75 GHz

–12 dB

SCC22, 4.75 GHz – 11.1 GHz –9 dB

OUT0_CM

AC common-mode voltage on

OUT0±

(1)

Default setting, PRBS31, 11.88 Gbps 8 mV (rms)

OUTPUT JITTER

ADDJ

Additive jitter

(1)

Measured at SDI_OUT1+ and SDI_OUT2+,

OUT0± disabled

PRBS10, 12G/6G/3G/HD/SD

0.03 UI

(1) These parameters support SMBus 2.0 specifications.

6.6 Recommended SMBus Interface Timing Specifications

over recommended operating supply and temperature ranges unless otherwise specified

(1)

PARAMETER TEST CONDITIONS MIN NOM MAX UNIT

SCL

SMBUS SCL frequency 10 400 kHz

BUF

Bus free time between stop and start

condition

See Figure 1. 1.3 µs

HD:STA

Hold time after (repeated) start condition After this period, the first clock is generated. 0.6 µs

SU:STA

Repeated start condition setup time See Figure 1. 0.6 µs

SU:STO

Stop condition setup time See Figure 1. 0.6 µs

HD:DAT

Data hold time See Figure 1. 0 ns

SU:DAT

Data setup time See Figure 1. 100 ns

LOW

Clock low period See Figure 1. 1.3 µs

HIGH

Clock high period See Figure 1. 0.6 µs

Clock and data rise time See Figure 1. 300 ns

Clock and data fall time See Figure 1. 300 ns

POR

SMBus ready time after POR

Time from minimum VDDIO to SMBus valid

write or read access

50 ms

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LMH1208: 超高清UHD-SDI双路电缆驱动器技术文档

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