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| 型号： | AD9715BCPZRL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 37/80页 |
| 文件大小： | 0K |
| 描述： | IC DAC DUAL 10BIT LO PWR 40LFCSP |
| 产品培训模块： | Data Converter Fundamentals DAC Architectures |
| 标准包装： | 750 |
| 系列： | TxDAC® |
| 位数： | 10 |
| 数据接口： | 串行 |
| 转换器数目： | 2 |
| 电压电源： | 模拟和数字 |
| 功率耗散（最大）： | 86mW |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 40-LFCSP-VQ（6x6） |
| 包装： | 带卷 (TR) |
| 输出数目和类型： | 4 电流，单极 |
| 采样率（每秒）： | 125M |
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AD9714/AD9715/AD9716/AD9717
Rev. A | Page 42 of 80
Table 15. Timer Register List
Bit Name
Description
CLKMODEQ[1:0]
Q data path retimer clock selected output. Valid after the searching bit goes low.
Searching
High indicates that the internal data path retimer is searching for the clock relationship (DAC is not usable until it is low again).
Reacquire
Changing this bit from 0 to 1 causes the data path retimer circuit to reacquire the clock relationship.
CLKMODEN
0: uses CLKMODEI/CLKMODEQ values (as computed by the two internal retimers) for I and Q clocking.
1: uses the CLKMODE value set in CLKMODEI[1:0] to override the bits for both I and Q retimers (that is, force the retimer).
CLKMODEI[1:0]
I data path retimer clock selected output. Valid after searching goes low.
If CLKMODEN = 1, a value written to this register overrides both the I and Q automatic retimer values.
Table 16. CLKMODEI/CLKMODEQ Details
CLKMODEI[1:0]/CLKMODEQ[1:0]
DCLKIO-to-CLKIN Phase Relationship
RETIMER-CLK Selected
00
0° to 90°
Phase 2
01
90° to 180°
Phase 3
10
180° to 270°
Phase 3
11
270° to 360°
Phase 1
When RESET is pulsed high and then returns low (the part is in
SPI mode), the retimer runs and automatically selects a suitable
clock phase for the RETIMER-CLK within 128 clock cycles. The
SPI searching bit, Bit 4 of SPI Address 0x14, returns to low,
indicating that the retimer has locked and the part is ready for
use. The reacquire bit, Bit 3 of SPI Address 0x14, can be used to
reinitiate phase detection in the I and Q retimers at any time.
CLKMODEQ[1:0] and CLKMODEI[1:0] of SPI Address 0x14
provide readback for the values picked by the internal phase
detectors in the retimer (see Table 16).
To force the two retimers (I and Q) to pick a particular phase
for the retimer clock (they must both be forced to the same
value), CLKMODEN, Bit 2 of SPI Address 0x14, should be set
high and the required phase value is written into CLKMODEI[1:0]
and CLKMODEQ[1:0]. For example, if the DCLKIO and the
CLKIN are in phase to the first order, the user can safely force the
retimers to pick Phase 2 for the RETIMER-CLK. This forcing
function may be useful for synchronizing multiple devices.
In pin mode, it is expected that the user tie CLKIN and DCLKIO
together. The device has a small amount of programmable
functionality using the unused SPI pins (SCLK, SDIO, and CS).
If the two chip clocks are tied together, the SCLK pin can be
tied to ground, and the chip uses a clock for the retimer that is
180° out of phase with the two input clocks (that is, Phase 2,
which is the safest and best option). The chip has an additional
option in pin mode when the redefined SCLK pin is high. Use
this mode if using pin mode, but CLKIN and DCLKIO are not
tied together (that is, not in phase). Holding SCLK high causes
the internal clock detector to use the phase detector output to
determine which clock to use in the retimer (that is, select a
suitable RETIMER-CLK phase). The action of taking SCLK
high causes the internal phase detector to reexamine the two
clocks and determine the relative phase. Whenever the user
wants to reevaluate the relative phase of the two clocks, the
SCLK pin can be taken low and then high again.
ESTIMATING THE OVERALL DAC PIPELINE DELAY
DAC pipeline latency is affected by the phase of the RETIMER-
CLK that is selected. If latency is critical to the system and must
be constant, the retimer should be forced to a particular phase and
not be allowed to automatically select a phase each time.
Consider the case in which DCLKIO = CLKIN (that is, in
phase), and the RETIMER-CLK is forced to Phase 2. Assume
that IRISING is 1 (that is, Q data is latched on the rising edge
and I data is latched on the falling edge). Then the latency to the
output for the I channel is three clock cycles (D-FF 1, D-FF 3,
and D-FF 4, but not D-FF 2 because it is latched on the half
clock cycle or 180°). The latency to the output for the Q channel
from the time the falling edge latches it at the pads in D-FF 0
is 2.5 clock cycles ( clock cycle to D-FF 1, 1 clock cycle to
D-FF 3, and 1 clock cycle to D-FF 4). This latency for the AD9714/
AD9715/AD9716/AD9717 is case specific and needs to be calcu-
lated based on the RETIMER-CLK phase that is automatically
selected or manually forced.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD9715-DPG2-EBZ | 功能描述:ADC 12BIT DUAL 40LFCSP RoHS:是 类别:编程器，开发系统 >> 评估板 - 数模转换器 (DAC) 系列:TxDAC® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- DAC 的数量:4 位数:12 采样率（每秒）:- 数据接口:串行，SPI? 设置时间:3µs DAC 型:电流/电压 工作温度:-40°C ~ 85°C 已供物品:板 已用 IC / 零件:MAX5581 |
| AD9715-EBZ | 制造商:Analog Devices 功能描述:DUAL 10 BIT LOW POWER CONVERTER - Boxed Product (Development Kits) |
| AD9716 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual, 8-/10-/12-/14-Bit Low Power Digital-to-Analog Converters |
| AD9716BCPZ | 功能描述:IC DAC DUAL 12BIT LO PWR 40LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TxDAC® 标准包装:1 系列:- 设置时间:4.5µs 位数:12 数据接口:串行，SPI? 转换器数目:1 电压电源:单电源 功率耗散（最大）:- 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOICN 包装:剪切带 (CT) 输出数目和类型:1 电压，单极；1 电压，双极 采样率（每秒）:* 其它名称:MCP4921T-E/SNCTMCP4921T-E/SNRCTMCP4921T-E/SNRCT-ND |
| AD9716BCPZRL7 | 功能描述:IC DAC DUAL 12BIT LO PWR 40LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数模转换器 系列:TxDAC® 标准包装:47 系列:- 设置时间:2µs 位数:14 数据接口:并联 转换器数目:1 电压电源:单电源 功率耗散（最大）:55µW 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:28-SSOP（0.209"，5.30mm 宽） 供应商设备封装:28-SSOP 包装:管件 输出数目和类型:1 电流，单极；1 电流，双极 采样率（每秒）:* |
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